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Using the new msg_source program with 1.500 instances against a single
msg_sink I found the msg_source process to spawn two worker threads for
synchronously sending the data towards the receiving socket. This should
not happen: Per destination node we only create one queue. We strictly
only add pthreadpool jobs one after the other, so a single helper thread
should be perfectly sufficient.
It turned out that under heavy overload the main sending thread was
scheduled before the thread that just had finished its send() job. So
the helper thread was not able to increment the pool->num_idle variable
indicating that we don't have to create a new thread when the new job
is added.
This patch moves the signalling write under the mutex. This means that
indicating readiness via the pipe and the pool->num_idle variable happen both
under the same mutex lock and thus are atomic. No superfluous threads anymore.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
This can avoid syscalls when multiple jobs are finished simultaneously
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
pthreadpool_add_job is in our hottest code path for r/w intensive workloads, so
we should avoid anything CPU-intensive. pthreadpool used to malloc each job and
free it in the worker thread. This patch adds a FIFO queue for jobs that helper
threads copy from, avoiding constant malloc/free. This cuts user space
CPU in the local-bench-pthreadpool benchmark by roughly 10% on my system.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Kamen Mazdrashki <kamenim@samba.org>
Reviewed-by: Simo Sorce <simo@samba.org>
Reviewed-by: Michael Adam <obnox@samba.org>
The current could would crash if a pthreadpool was created, deleted and the
process then fork()s. "pthreadpools" is NULL in this case, but the
pthread_atfork handlers are in place. This fixes walking the pthreadpools list
in reverse.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Kamen Mazdrashki <kamenim@samba.org>
Reviewed-by: Simo Sorce <simo@samba.org>
Reviewed-by: Michael Adam <obnox@samba.org>
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: David Disseldorp <ddiss@samba.org>
Autobuild-User(master): David Disseldorp <ddiss@samba.org>
Autobuild-Date(master): Tue Jan 28 19:06:40 CET 2014 on sn-devel-104
These binaries are for developer or selftest use, and are not
supported for installation onto the system. The autoconf build does
not install these binaries, and so neither should the waf build.
Andrew Bartlett
Reviewed-by: Andreas Schneider <asn@samba.org>
Autobuild-User(master): Andreas Schneider <asn@cryptomilk.org>
Autobuild-Date(master): Thu Nov 22 12:00:36 CET 2012 on sn-devel-104
Signed-off-by: Bjoern Jacke <bj@sernet.de>
Autobuild-User(master): Björn Jacke <bj@sernet.de>
Autobuild-Date(master): Thu Jun 28 16:43:13 CEST 2012 on sn-devel-104
on success, errno on fail and return the jobid in a separate variable.
I need this fix for my vfs_aio_pthread.c module.
Autobuild-User: Jeremy Allison <jra@samba.org>
Autobuild-Date: Thu Dec 22 12:12:33 CET 2011 on sn-devel-104
The -framework CoreFoundation is required by the charset_macosxfs module
The system/time.h header is required to access the replacement clock_gettime()
Andrew Bartlett
Autobuild-User: Andrew Bartlett <abartlet@samba.org>
Autobuild-Date: Fri Sep 23 10:58:02 CEST 2011 on sn-devel-104
