Showcasing UltraSPARC T1 with Directory Server's searches

So my Friend and Sun's Directory Server (DS) developer Gilles Bellaton recently got his hands onto an early access Niagara (UltraSPARC T1) system; something akin to SunFireTMT2000.

The chip in the system only had 7 active cores and thus 28 hardware threads (a.k.a strands) but we wanted to check how well it would perform on DS. The results here are a little anecdotal: we just ran a few quick test with the aim to showcase Niagara but nevertheless the results we're beyond expectations.

If you consider the Throughput Engine architecture that Niagara provides (what the Inquire says), we can expect it to perform well in highly multithreaded loads such as a directory search test. Since we had limited disk space on the system the slapd instance was created on /tmp. We realize that this is not at all proper deployment conditions; however the nature of the test is such that we would expect the system to operate mostly from memory (Database fully cached). The only data that would need to go to disk on a real deployment would be the 'access log' and this typically is a not a throughput limiting subsystem.

So we can prudently expect that a real on-disk deployment of a read-mostly workload in which the DB can be fully cached could perform perhaps closely to our findings. This showcase test is a base search over a tiny 1000 entries Database using 50 thread slapd. Slapd was not tuned in any way before the test. For simplicity, the client was run on the same system as the server. This means that, on the one hand, the client is consuming some CPU away from the server, but on the other it reduces the need to run the Network adapter driver code. All in all, this was not designed as a realistic DS test but only to see in a few hours of access time to the system if DS was running acceptably well on this new cool Hardware.

The Results were obtained with Gilles' workspace of DS 6.0 optimized build of August 29th 2005. The number of CPUs where adjusted by creating psrset.


Numbers of Strands                   Search/sec			Ratio
1                                     920			 1    X
3 (1 core; 3 str/core)               2260			 2.45 X
4 (1 core; 4 str/core)               2650			 2.88 X
4 (4 core; 1 str/core)               4100			 4.45 X
14 (7 cores, 2 str/core) 	    12500			13.59 X
21 (7 cores, 3 str/core)            16100			17.5  X
28 (7 cores; 4 str/core)            18200			19.8  X



Those are pretty good scaling numbers straight out of the box. While other more realistics investigation will be produced, this test at least showed us early that Niagara based systems were not suffering from an flagrant deficiencies when running DS searches.

[T]:

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