e martë Nën 09, 2004

Ouch...Bad News if its True

The front page of the Wall Street Journal was depressing today with a lead article entitled Drag on High-Tech Recovery: Companies Do More with Less (Free this week only.) A few relevant quotes (read 'em and weep with me):

"Corporate spending on technology gear grew roughly 15% in the first half of the year...but...the recovery already is losing steam. The growth in corporate technology spending slowed to 9% in the third quarter.
The shift has big implications for the broader economy. It's terrific news for corporate buyers but is holding back a major driver of overall economic growth...Productivity, driven in part by technology, has risen for 14 straight quarters, the longest stretch in 60 years, though it too is showing signs of slowing."
"Forrester Research, which focuses on technology, says buyers are in a long period of 'digestion' that will extend until 2008. Corporate technology spending will grow only about 6% a year between now and then, Forrester says, as businesses figure out how to extract value from their purchases of the 1990s."

And this really hurts:
"Instead, tech buyers are most excited about new offerings that help them cut costs. Computer servers from Dell replace far more expensive models from vendors such as Sun Microsystems Inc. The free Linux operating system reduces software costs. Other emerging open-source programs -- which generally are available free of charge and are easily modified by users -- threaten traditional business-software packages from suppliers such as Oracle Corp. Internet telephone systems slash communications costs. Indian programmers reduce the cost of writing custom programs."

I see all sorts of problems with these assertions. If the period of 'digestion' runs until 2008, companies would be running on servers that are 10 years old or at least 3 generations out of date. At a certain point, the Mean Time To Failure of 10 year old electronic components rises to the level at which the servers must be replaced on economic/availability/supportability grounds. Not to mention that the increasing sophistication of applications tends to require later generations of hardware just to keep up with the complexity.

e shtunë Tet 30, 2004

Being Julia

This weekend's cinematic outing was "Being Julia," a pretty period piece about London theater in the 1930s based on a novella of W. Somerset Maugham. I love Annette Benning and Jeremy Irons. I also liked the background music and since they often go to nightclubs we get Cole Porter tunes sung live. The costumes and scenery are fantastic. However, several elements of the story strained credulity and ultimately made the movie less than satisfying. The final scene of Julia's revenge is quite good but the movie dragged in the middle.

Why do bad things happen to good people

I am working my way throught the Old Testament book of Job. This guy seems to be a pawn in the dispute between God and Satan and as a consequence, very bad things happen to him. The book is definitely from a different culture because his "friends" have a one note reason for all these bad things...'You must have sinned against God.' God himself shows up in chapter 38 and discusses the issue with Job. The book of Job is part of the 'Kethubim' or Writings section of the Old Testament, which includes Psalms, Proverbs, Ecclesiastes, Song of Songs, Ruth and others. Job, Proverbs and Ecclesiates are considered Wisdom literature from the Ancient Near East. The picture at the left is a detail from a Latin Illuminated manuscript from Northern Italy, ca. 1273. Poor Job is covered with boils while his weeping wife stands over him and his 'friends' accuse him. It is from an exhibition of manuscripts at Southern Methodist University by one of my old professors, Charles Ryrie.

e mërkurë Tet 27, 2004


I've been categorized!

This is just so cool.   And here, for all these years, I thought I was just a geek.   Of course, being a geek made high school hell. OK, I admit it, I was not on the football team.   But I was the first kid in my high school to get a teletype login to Darthmouth's computer in the 1960s.   I was the first kid to waste thousands of dollars playing Canadian road race on that teletype.   I learned Basic and Fortran on that computer.   I worked my way through university in the computer center operating and managing a Univac 1108.   I wrote my programs for that thing on punched cards.   (The link brings back so many memories.   Interesting insight into the economics of mainframes.   In 1968 you could pick up a 1.3 MHz CPU with half a megabyte of magnetic core memory and 100 megabyte hard drive for a mere US$1.6 million.  We had several FastRand II rotating drum memory which weighed about 2 tons, had 90MBs usable and rotated at 880 RPM with an average access time of 92 milliseconds.)   Its not actually me in this picture from 1973, but I did hang many of those old half inch reels of tape and several spewed all over the computer room.

But before you feel sorry for me, check it out!   Now in the new millenium I have been upgraded from just a dweeby geek to a technosexual!!!

I feel so much better about myself now!

You just never know what you will find out in the blogosphere.  

e diel Tet 24, 2004

The Beauty of Mathematics

The New York Times has a great article asking the question "What Makes an Equation Beautiful" (NB ID and password required.) The NY Times picked up on an article from Physics World where Robert P. Crease surveyed the readers of Physics World asking the question what are The Greatest Equations Ever (NB No id required for this article) and the winner is below:

The runners up are displayed on the left. The NY Times article shows why this is important in the following quote "The wonder of mathematics is that it captures precisely in a few symbols what can only be described clumsily with many words. Those symbols, strung together in meaningful order, make equations - which in turn constitute the world's most concise and reliable body of knowledge." One of the great philosophical questions is 'Why does mathematics so accurately describe the world?' I utilize the mathematics of Little's Law in performance and capacity studies and its simple explanation of complex phenomena is amazing.

Physicist and Nobel laureate Richard Feynman once remarked "you can recognize truth by its beauty and simplicity." Werner Heisenberg, one of the developers of the theory of quantum mechanics, wrote that the truth of his theory "was immediately found convincing by virtue of its completeness and abstract beauty." When thinking about the why questions of mathematics philosophically, I am forced to conclude that they are a powerful apologetic or argument for the existence of God, the creator and designer of the universe. Johannes Kepler thought of his scientific labors on planetary motion as "thinking God's thoughts after him."

One of the books that has influenced my thinking in this area is The Evidential Power of Beauty: Science and Theology Meet by Thomas Dubay. It is the source of some of the quotes above. Highly recommended. Check it out.

Graphics courtesy of the New York Times who cleaned up the tables in Physics Review. I did not shrink them because of font problems when trying to make them smaller.

e shtunë Tet 23, 2004

Friday Night Lights

Friday night's cinematic outing was, appropriately enough, Friday Night Lights. I was drawn to the movie because we live in Texas and because, until I moved here 20 years ago, I had no concept of a high school football game selling out Texas Stadium, the Houston Astrodome or being broadcast on ESPN. I do enjoy football but this is a whole other dimension of genuine fanaticism. In the movie, the whole town is obsessed with the team and all the businesses close on Friday afternoon with signs 'Gone to the Game.' The boosters put pressure on the coach, brilliantly played by Billy Bob Thornton, to win the state championship. The adults in the town take pictures of their children with the high school players. Then the players have their own family situations and dysfunction to deal with. Probably the most telling dialogue in the movie occurs when one player says "Cmon, lighten up. We are only 17" and another responds, "I don't feel 17. Do you feel 17?"

Technically, as a movie, Friday Night Lights is great. However, as you see the level of pressure on these kids, it is horrific. High intensity football as it is played in large schools with brutal hitting and serious injuries that are not properly repaired is not a pretty picture. Fortunately this movie occurred in 1988 before rampant steroid use or I am sure that would have also happened. Its happening now in the large high schools in the Dallas area where we live. The following article discusses steriod use and denial in Plano, Texas.

My reaction to this display of over-the-top high school athletics is to think of the horrific practice condemned explicitly in the Old Testament called "passing your children through the fire to Molech" which is an idiom for sacrificing your children by burning them. However, the barbarity of child sacrifice, or even Roman gladiatorial combat, seems to be alive and well in high school athletics where winning is everything and no one counts the cost in physical, emotional, spiritual or psychological terms. Where is the line between excellence in athletics and abuse of high school students? This movie shows it is not hard to cross over that line.

e hënë Tet 18, 2004

Capacity versus Performance

When I started this blog I said that I did performance and capacity planning for Sun's customers. I want to offer up a technical study or two to help others with performance issues. I entitled this Capacity vs Performance in order to highlight the difference. Often a capacity limitation manifests itself as a performance issue. In order to differentiate between performance and capacity, performance might be defined as 'How fast it is going' while capacity is 'the maximum performance of the system or an individual component.' Imagine capacity as the dump truck carrying a load and performance as a sports car racing. Even a sports car has to slow down for corners. Not to be too simple but we need to look at each component of the system's performance, CPU, memory, network, disk and tape.

One specific example was a customer who has a directory on the internet. Their customers submit searches from multiple sites and the Service Level Agreement (SLA) was no more than 5% of requests with response times of over 3 seconds. Currently 15% of request take more than 3 seconds which puts our customer in a penalty situation. The system is a 6800 with 12x900MHz CPUs. Unfortunately someone attempted to fix the problem by 'throwing more iron' at it and adding CPUs and memory without knowing why there was a problem. Lets look at a few numbers. From vmstat:

 procs     memory            page            disk          faults      cpu
 r b w   swap  free  re  mf pi po fr de sr m0 m1 m1 m1   in   sy   cs us sy id
 0 2 0 8948920 5015176 374 642 10 12 13 0 2 1  2  1  2  132 2694 1315 14  3 83
 0 19 0 4089432 188224 466 474 50 276 278 0 55 5 5 4 3 7033 6191 2198 19  4 77
 0 19 0 4089232 188304 430 529 91 211 211 0 34 8 6 5 4 6956 9611 2377 16  5 79
 0 18 0 4085680 188168 556 758 96 218 217 0 40 12 4 6 4 6979 7659 2354 18 6 77
 0 18 0 4077656 188128 520 501 75 217 216 0 46 9 3 5 2 7044 8044 2188 17  5 78

There is something odd about these numbers. On vmstat, we look at the right 3 columns, us=user, sy=system and id=idle, so there is over 50% idle CPU available to throw at the problem. One way to detect a memory problem is to look at the sr, Scan Rate, column of vmstat (near the middle of the display.) If the page scanner ever starts running, or sr gets over 0, then we need to dig deeper into the memory system. The very odd part of this display is that the blocked queue on the left of the display has 18 or 19 processes in it but there are no processes in the run queue. That means we are blocking somewhere in Solaris without using all the CPUs available to us.

So now, we need to turn to the I/O subsystem. With Solaris 8, the iostat command has a new switch, -C which will aggregate I/Os at the controller level. My favorite iostat command is iostat -xnMCz -T d (interval in seconds) (count of iostat outputs):

                    extended device statistics              
    r/s    w/s   Mr/s   Mw/s wait actv wsvc_t asvc_t  %w  %b device
  396.4   10.7    6.6    0.1  0.0 20.3    0.0   49.9   0 199 c1
  400.2    8.8    6.7    0.0  0.0 20.2    0.0   49.4   0 199 c3
  199.3    6.0    3.3    0.0  0.0 10.1    0.0   49.4   0  99 c1t0d0
  197.1    4.7    3.3    0.0  0.0 10.2    0.0   50.4   0 100 c1t1d0
  198.2    3.7    3.4    0.0  0.0  9.4    0.0   46.3   0  99 c3t0d0
  202.0    5.1    3.3    0.0  0.0 10.8    0.0   52.4   0 100 c3t1d0

Whoa! On controller 1 we are doing 396 reads per second and on controller 3 we are doing 400 reads per second. On the right side of the data we see that iostat thinks the controller is almost 200% busy (iostat error...never checked to see if there has been a bug filed.) So then the individual disks are doing almost 200 reads per second and iostat figures thats 100% busy on the disks. That leads us to a rule of thumb or hueristic, that individual disks perform at approximately 150 I/Os per second. This does not apply to LUNs or LDEVs from the big disk arrays. So our examination of the numbers lets us suggest adding 2 disks to each controller and relaying out the data. Unfortunately, due to the disk array configurations, we could only add 1 disk to each controller. That did improve the situation as seen by the next iostat:

                    extended device statistics              
    r/s    w/s   Mr/s   Mw/s wait actv wsvc_t asvc_t  %w  %b device
  410.6    5.4    4.8    0.0  0.0  5.7    0.0   13.7   0 218 c1
  386.0    9.0    4.6    0.0  0.0  5.3    0.0   13.4   0 211 c3
  129.4    2.2    1.5    0.0  0.0  1.9    0.0   14.7   0  73 c1t0d0
  139.4    1.8    1.6    0.0  0.0  2.3    0.0   16.0   0  79 c1t1d0
  141.8    1.4    1.7    0.0  0.0  1.5    0.0   10.4   0  66 c1t2d0
  133.0    1.0    1.6    0.0  0.0  2.1    0.0   15.6   0  76 c3t0d0
  125.4    2.2    1.5    0.0  0.0  1.9    0.0   14.6   0  72 c3t1d0
  127.6    5.8    1.5    0.0  0.0  1.4    0.0   10.2   0  63 c3t2d0

We are still close to the top end of the performance of an individual disk but we dropped from 15% of transactions out of the SLA down to 6 or 7% of transactions out of the SLA. And the CPUs look good:

 procs     memory            page            disk          faults      cpu
 r b w   swap  free  re  mf pi po fr de sr m0 m1 m1 m1   in   sy   cs us sy id
 0 2 0 9283064 5482928 787 1293 36 0 0 0 0  0 23  0 13 5145 14763 1394 27 6 67
 0 1 0 6547512 2483056 869 984 110 0 0 0 0  0 14  0  8 5377 8114 1372 23  6 71
 0 1 0 6525816 2461496 1190 1230 0 0 0 0 0  0  0  0  0 6414 17808 1402 33 9 58
 0 1 0 6516240 2451976 1316 481 0 0 0 0  0  0  0  0  0 5432 8226 1509 30  7 63
 0 1 0 6506616 2442768 684 660 0 0 0  0  0  0  0  0  0 5188 16922 1259 26 7 67

Now we still have plenty of idle CPU time and only 1 or 2 in the blocked queue. It would have been nice to be able to add 2 disks to each controller but even 1 disk on each alleviated this problem. After this, the customer studied some of the internal design of their directory search algorithms. As the proverb says, Fixing one performance or capacity limitation only exposes the next issue.

The point of this exercise is looking at all the numbers and attempting to locate the precise nature of the problem. Do not assume adding CPUs and memory will fix all peformance problems. In this case the search programs were exceeding the capacity of the disk drives which manifested itself as a performance problem of transactions with extreme response times. All those CPUs were waiting on the disk drives. One other thing to note in this example is that there were no 'magic' /etc/system parameters to tweak. There are fewer and fewer knobs (or parameters) in Solaris to adjust to improve performance.

e shtunë Tet 16, 2004

Today in History

What an interesting day October 16th is:

In 1793 Marie Antoinette was beheaded.

In 1859 Abolitionist John Brown led the raid on Harper's Ferry, an early warning of the American Civil War.

In 1962 the Cuban Missile Crisis began as President Kennedy was informed that Russia was setting up missile bases in Cuba.

In 1970 Anwat Sadat was elected president of Egypt. (Sadat is on the left, President Jimmy Carter in the center and Prime Minister Menachem Begin of Israel on the right.)

In 1978 Cardinal Karol Wojtyla was elected to become Pope John Paul II.

e mërkurë Tet 13, 2004

Solaris 10 x86 Confession

Team,

I tend to participate in aliases and share problems I have run into. Tonight I have to confess that I croaked my Windows 2000 partition when I attempted to dual boot my laptop last Saturday. First let me reassure you that I know this can be done and I completed the process Thursday night. However, I will confess my failure in order to save you heartache and grief.

I am excited about trying out the new features of Solaris 10 x86 like DTrace and Containers. Download your copy of Solaris 10 x86 here. I first cleaned up my harddrive by deleting outdated files and taking out the trash. Then I defragmented my drive using the Windows 2000 Disk Defragmenter. This is important for resizing the Windows partition. Then I did follow RULE #1 and made a backup of my important files. I used the backup facility of the Nero tool (burning CDs, not Rome, get it.) I made 2 mistakes here. Mistake #1 was I did not follow RULE #2...Verify your backup and so several files would not restore later because of media problems. Mistake #2 was that I backed up my data starting at the level of 'My Documents,' not at the level of my User ID (one level up) which would have included my Application Data folder, that is my bookmarks file and my Outlook PST file. Now I have 'recent' backups of those files, but I lost 2 weeks of data when I thought I had fresh backups of these files.

My problem was not understanding some features of the tools I attempted to use. I picked the tool Partion Commander to resize the 40GB harddrive into a 25GB partition for Windows 2000 and a 14+GB partition for Solaris 10 x86. Unfortunately for me, Partition Commander installed a utility, checkmbr (Check Master Boot Record) which automatically attempts to reinstall a base Master Boot Record. When you install another OS like Linux or Solaris x86, the new OS must update the master boot record and offer you the choice of which OS partition to boot. The repartion worked and the Solaris x86 install worked fine. I rebooted Solaris x86 several times and was fine. The problem occurred when I rebooted the Windows 2000 partition and the automatic utility checkmbr found the Solaris boot partition chooser in the master boot record. It attempted to restore it to its original state and then neither partition would boot.

I believe you can and should do this. There are issues in doing this that are challenging but documents like this one can help you. I happened to have a Toshiba Tecra 9100 laptop which needs some BIOS updates:

Disable USB Legacy FDD support

Disable USB Legacy support for keyboard and mouse if a separate setting

Disable Parallel port

On Thursday night, I got out my Knoppix CD, which everyone should have in their CD case as a rescue CD. It has a utility, qtparted which I used to partition my hardrive. Other versions of Linux also have this utility. I then rebooted Windows 2000 and let checkdisk run to get used to the new partition size. Then I took my stack of 4 Solaris 10 x86 CDs and ran the install. Sucess! I am ironing out a few display issues but looking forward to writing my first DTrace program tomorrow.

Speaking of Confessions

"You have made us for yourself, and our hearts are restless until they find their rest in you, O Lord" This famous quote is from the first paragraph of the first book of The Confessions of St. Augustine. I decided to reach back and review a classic for my contemplation for the next few weeks. My suggestion is not to read about great books but read the great books yourself.

e hënë Tet 11, 2004

A Movie about Geeks for Geeks

This weekend's cinematic outing was Primer.   Cherryl Dawson and Leigh Ann Palone, The Movie Chicks, summed it up as, "The movie is hard to describe and even harder to fully grasp. It's not for everybody, but could be a cult hit amongst the pocket-protector crowd." I know they are talking about me and, if you are reading this, perhaps they are talking about you too. Four guys extend their extreme engineering work weeks in a garage and develop something amazing. The protagonists are engineers and dramatic and compelling. Shot on an amazingly low budget (note the picture of the device itself), this movie demonstrates it is not a multimillion dollar blockbuster in lots of ways, but it is creative in the way the movies Pi or Momento were.


e shtunë Tet 09, 2004

Sarah McLachlan

In the creative music video category, I nominate Sarah for this effort. She had the video on its own website but I guess the traffic was too heavy after bloggers started watching it. If you have Itunes installed, click this link One warning though...do not watch this at work. I hate the sight of grown men sniffling without a Kleenex. When I watch it, I am faklemp.

Historical Novels

My mother in law gave me a sweatshirt with the complaint "So many books, So little time" and how true it is. Naturally I read my share of technical manuals, but for enjoyment I have been reading historical fiction lately. My favorites have been from the Roman period. First, Lindsey Davis has a great series of novels starring Marcus Didius Falco, the emperor Vespasian's chief fixer/detective/spy. Then Colleen McCullough, author of the Thornbirds miniseries, did a series of novels on Julius Ceasar.

On my doctor's recommendation I am switching historical periods and reading some of Bernard Cornwell's novels on the Napoleanic wars. I picked up Sharp's Eagle yesterday, so I am going to go read now.

e premte Tet 08, 2004

Get on the Grid!

Everbody is positively mental over Grid computing (aka distributed computing) today. You may be curious about the Grid phenomena but you are worried that you have not yet installed Solaris x86 at home. Not to worry. I know you are going to make the switch Real Soon Now, but even before you do, you can participate in the grid with your home computer even if it runs an operating system from another company. :)

Grids have been a long time. In the 90's I participated in SETI@Home aka Search for Extraterrestrial Intelligence aka Search for Little Green Men. Its an impressive project that has 5.2 million users who have donated 2 million YEARS of computer time to the project. Today they are working at 66.5 Teraflops (trillion floating point operations) per second. That's some serious computational rock and roll. For my money though Little Green men is just so last millenium. I mean if Agent Mulder has given up the search, why am I still working on it? :)

Another of my favorite grid projects is Folding@Home . This Grid project is modeling "protein folding, misfolding, aggregation and related diseases" (like Alzheimer's.) Currently they have 171,628 CPUs running Windows, Mac OS X and Linux, which means that they have 196 Teraflops on the problems. The image preceding this paragraph is a Beta Amaloid peptide, "thought to be responsible for nerve cell death in Alzheimer's Disease." It is a part of Projects 722-724 so your computer could be a part of helping with Alzheimer's research. Truly a worthy cause and you can join up here.

I was folding proteins for Professor Pande, but 2 years ago I had a colon polyp removed that was becoming cancerous. So these days my computers are working on cancer research headed up by the University of Oxford. There are over a million members with almost 3 million computers working on the problem and yesterday 270,000 results sets were submitted. If you are concerned about cancer, download the software from here. Then join my team-- SunONE. I am not actually the captain but I liked the name of the team.

I urge you to pick one of these projects and let your computer(s) crunch numbers while you are not actively using it. Each one of these processes runs in the background at a lower priority than all other work your computer is doing. Most can be paused but you will not notice them in the background because your OS only schedules them when there are idle cycles available. If you are surfing the web, they back off. Even while you are typing they work, and trust me, a modern CPU is doing a lot of waiting around even if you type 300 words per minute. If "a mind is a terrible thing to waste," wasting good computer cycles is just criminal. Thanks for your support

e mërkurë Tet 06, 2004

Work

I've been with Sun for 7 years in Professional Services.   I primarily do large systems, HA clusters, Oracle 9iRAC clusters and performance and capacity planning on these systems for our customers.  I will talk more about my work later.

 

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