Hi Gustaf, thanks for the suggestion.
I tried adding a zero, and then another zero, to
export TCMALLOC_MAX_TOTAL_THREAD_CACHE_BYTES= 167772160
and still had terrible naviserver performance at 100 minthreads.
When I dropped a digit, ie:
export TCMALLOC_MAX_TOTAL_THREAD_CACHE_BYTES= 1677721
naviserver failed to work at all, which serves as a good proof that the setting
was taking effect.
That being said, I went with your 4xCPU cores suggestion, and set minthreads at
32 to test again.
At that setting, performance was the same as at minthreads=10, so I can live
with that!
-john
On Jan 6, 2014, at 3:05 PM, Gustaf Neumann <neum...@wu.ac.at> wrote:
> The "best" number of threads depends on many things, including the hardware
> (e.g. number of cores). For most cases, i recommend not more than than 4
> threads/core. With high number of threads a low numbers of cores, context
> switching might degrade performance.
>
> concerning 100 threads vs. tcmalloc: you might try to increase
> TCMALLOC_MAX_TOTAL_THREAD_CACHE_BYTES (defaults to 16MB). For more details,
> see:
> http://gperftools.googlecode.com/svn/trunk/doc/tcmalloc.html
>
> concerning waiting time in threads: a good number of threads can be
> determined via observing the queuing time and the number of queue requests
> recorded by naviserver (See in nsstats (from bitbucket) the "process" page).
> The best number of theads is the lowest number where the number of queued
> requests is low (e.g. less than 0.1%) or the queuing time is acceptable (e.g.
> less than 0.1 ms). The numbers certainly depend on the application, but when
> one has essentially no queued requests with 30 connection threads, then there
> is no benefit in increasing the number of connection threads.
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