fprintf() does buffered I/O, where as write() does unbuffered I/O. So once the write() completes, the data is in the file, whereas, for fprintf() it may take a...
fprintf() does buffered I/O, where as write() does unbuffered I/O. So once the write() completes, the data is in the file, whereas, for fprintf() it may take a while for the file to get updated to reflect the output. This results in a significant performance difference - the write works at disk speed. The following is a program to test this:#include <fcntl.h>#include <unistd.h>#include <stdio.h>#include <stdlib.h>#include <errno.h>#include <stdio.h>#include...
fprintf() does buffered I/O, where as write() does unbuffered I/O. So once the write() completes, the data is in the file, whereas, for fprintf() it may take a while for the file to get updated...
This was a bit of surprise to me. The slides are available from my presentation at JavaOne on mixed language development. What I wasn't expecting was that there...
This was a bit of surprise to me. The slides are available from my presentation at JavaOne on mixed language development. What I wasn't expecting was that there would also be a video of the presentation.
This was a bit of surprise to me. The slides are available from my presentation at JavaOne on mixed language development. What I wasn't expecting was that there would also be a video of...
Different generations of SPARC processors implement different architectures. The architecture that the compiler targets is controlled implicitly by the -xtarget...
Different generations of SPARC processors implement different architectures. The architecture that the compiler targets is controlled implicitly by the -xtarget flag and explicitly by the -arch flag.If an application targets a recent architecture, then the compiler gets to play with all the instructions that the new architecture provides. The downside is that the application won't work on older processors that don't have the new instructions. So for developer's there is a...
Different generations of SPARC processors implement different architectures. The architecture that the compiler targets is controlled implicitly by the -xtarget flag and explicitly by the -arch...
With what appears to be minimal fanfare, an update of the SPARC Architecture has been released. If you ever look at SPARC disassembly code, then this is the...
With what appears to be minimal fanfare, an update of the SPARC Architecture has been released. If you ever look at SPARC disassembly code, then this is the document that you need to bookmark. If you are not familiar with it, then it basically describes how a SPARC processor should behave - it doesn't describe a particular implementation, just the "generic" processor. As with all revisions, it supercedes the SPARC v9 book published back in the 90s, having both corrections,...
With what appears to be minimal fanfare, an update of the SPARC Architecture has been released. If you ever look at SPARC disassembly code, then this is the document that you need to bookmark. If you...
On Monday 1 October I will be presenting at both JavaOne and Oracle Open World. The full conference schedule is available from here. The logistics for my...
On Monday 1 October I will be presenting at both JavaOne and Oracle Open World. The full conference schedule is available from here. The logistics for my sessions are as follows: JavaOne: 8:30am Monday 1 October. CON6714: "Mixed-Language Development: Leveraging Native Code from Java". San Francisco Hilton - Continental Ballroom 6 Oracle OpenWorld: 10:45am Monday 1 October. CON6382: "Maximizing Your SPARC T4 Oracle Solaris Application Performance". Marriott Marquis - Golden...
On Monday 1 October I will be presenting at both JavaOne and Oracle Open World. The full conference schedule is available from here. The logistics for my sessions are as follows: JavaOne:...
Vijay Tatkar will be talking about developing on Solaris next week Tuesday at 9am PST.
I've talked about building 64-bit libraries with position independent code. When building 64-bit applications there are two options for the code that the...
I've talked about building 64-bit libraries with position independent code. When building 64-bit applications there are two options for the code that the compiler generates: -xcode=abs64 or -xcode=abs44, the default is -xcode=abs44. These are documented in the user guides. The abs44 and abs64 options produce 64-bit applications that constrain the code + data + BSS to either 44 bit or 64 bits of address.These options constrain the addresses statically encoded in the...
I've talked about building 64-bit libraries with position independent code. When building 64-bit applications there are two options for the code that the compiler generates: -xcode=abs64...
I've talked before about calling inline templates from C++, I've also talked about calling inline templates efficiently. This time I want to talk about...
I've talked before about calling inline templates from C++, I've also talked about calling inline templates efficiently. This time I want to talk about efficiently calling inline templates from C++.The obvious starting point is that I need to declare the inline templates as being extern "C": extern "C" { int mytemplate(int); }This enables us to call it, but the call may not be very efficient because the compiler will treat it as a function call, and may produce suboptimal...
I've talked before about calling inline templates from C++, I've also talked about calling inline templates efficiently. This time I want to talk about efficiently calling inline templates...
If you are on a SPARC system you can get cache size information using the command fpversion, which is provided with Studio:$ fpversion A SPARC-based CPU is...
If you are on a SPARC system you can get cache size information using the command fpversion, which is provided with Studio:$ fpversion A SPARC-based CPU is available. Kernel says main memory's clock rate is 1012.0 MHz. Sun-4 floating-point controller version 0 found. An UltraSPARC chip is available. Use "-xtarget=sparc64vii -xcache=64/64/2:5120/256/10" code-generation option.The cache parameters are output exactly as you would want to pass them into the compiler - for each...
If you are on a SPARC system you can get cache size information using the command fpversion, which is provided with Studio:$ fpversion A SPARC-based CPU is available. Kernel says main memory's clock...
