Using DSEE 6.3.1 on T2000 - cool threads
I'm starting to wonder if we purchased the wrong hardware for our LDAP server upgrade. We are replacing DS5.2 on Solaris 9 running on V240 hardware with DSEE 6.3.1 Solaris 10 on T2000 hardware.
It seems the DSEE6.3.1 instance only takes advantage of one of the 32 cool thread processors, basically a waste for the rest of them. Furthermore, it seems that each of the 32 cool thread processors runs slower than the dual processor V240 by about 20% (using LDAP SDK searchrate tool). I do note the CPU utilization being way down on the T2000 (10%) versus the V240 (60- 80%), but why the slower performance? We have enough RAM to fit the entire directory into memory - cache settings set appropriately for database cache and entry cache (99% hit ratio). Indexes are identical on the two systems.
So, are all the observations I've made seem consistent with the T2000 design? Is there anything more I can do to improve performance? Any way to get the DSEE instance to use more than one cool thread concurrently? Would changing nsslapd-ds-home-directory to /tmp help with performance? Thought this should only be done on systems in which the entire directory could not fit into memory.
DS 6.x cannot really make use of all the threads available in your T2000. In some cases, it has actually been observed that DS performance degrades when too many vcpus are available. The sweet spot seems to be around 12 - 16. One configuration that has been used in the past is to create a zone for the DS that only has 12 - 16 CPUs and then to run DPS on another zone to make use of the rest of the hardware resources.
There is also the polling thread count, which was added to DSEE 6 specifically to remove a bottleneck encountered in the T2K platform. Before the T2K, there wasn't a need to consider more than one polling thread (that's the thread that manages the incoming request queue), but with so many vcpus, only having one polling thread was a significant bottleneck. You can experiment with raising that.
That said, I would not really consider the T2K an ideal hardware platform for the DS. The new Nehalem or AMD rigs are likely to give you better bang for your buck.
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