David Xu wrote:
ÔÚ Thursday 06 April 2006 17:12£¬Michael Vince дµÀ£º
I have also done benchmarking with libthr against Apache using 'ab' and
found it can deliver an extra amount of megabytes/sec of data (I think
it was about an extra 2000/requests sec) at the cost of giving the
server from what I remember almost double the 'average load' according
to 'top'
Given that if your machine has nothing else to do but deliver data
purely from Apache then even libthr is more worth while for Apache as well.
Mike
libpthread default uses M:N threads which means a thread may be on
userland scheduler's run queue, and FreeBSD kernel does not know,
so it will be not shown on average load, default system tools are not
very useful here.
David Xu
Yeah I figured that, which isn't fair because it makes pthread look
better then libthr when its not.
I did notice that during the tests that when benchmarking Apache under
libthr that when it was giving out the extra megabytes/sec speed that
the server did feel equally responsive even though 'top' was reporting
higher load.
I have also tried putting my Perl under libthr for a single thread log
analyzer and to my surprise it even could process logs faster.
libthr is also really useful for actually paying attention to tops 'thr'
column since it does show actual true thread number activity, under
pthread it shows a couple and under libc_r I could have 1000 threads
going but top just shows 1.
Mike
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