Just for demonstration, my system has relative low usage, but you can
see the output of top:
PID USERNAME THR PRI NICE SIZE RES STATE C TIME WCPU COMMAND
83831 cyrus 1 44 0 34068K 824K select 3 16:31 0.00% master
83834 cyrus 1 44 0 55296K 480K select 3 15:44 0.00% idled
28343 cyrus 1 44 0 93048K 5240K select 0 0:03 0.00% imapd
28383 cyrus 1 44 0 82208K 4920K select 1 0:02 0.00% imapd
28382 cyrus 1 44 0 80120K 4812K select 0 0:01 0.00% imapd
28350 cyrus 1 44 0 66420K 4300K select 3 0:01 0.00% imapd
28375 cyrus 1 44 0 66488K 4108K select 0 0:00 0.00% imapd
11942 cyrus 1 4 0 66392K 5060K accept 0 0:00 0.00% pop3d
12157 cyrus 1 44 0 66988K 5688K select 1 0:00 0.00% pop3d
12159 cyrus 1 44 0 66708K 5656K select 3 0:00 0.00% pop3d
12158 cyrus 1 44 0 66580K 5648K select 0 0:00 0.00% pop3d
12238 cyrus 1 4 0 66408K 5452K accept 0 0:00 0.00% lmtpd
As you can see, it's using CPUs 0, 1 and 3 at this point.
Raymond T. Sundland wrote:
When master receives a connection, it spawns a child process to manage
that connection. That would essentially make it multi-threaded making
use of the multiple CPUs when needed, I would think. Is that not the
case? You can launch multiple master processes, but that wouldn't
have any better guarantee to use multiple CPUs, either.
Atif Ghaffar wrote:
Hello,
I am a long time cyrus user but have not been hands on for a while.
At my current job we are running cyrus to manage all mailstore for
our ISP.
Recently I have migrate a couple of boxes to newer ones with more
cores per cpu.
when running htop -u cyrus, i see that only one core is being used
for most of the work and that seems to be a waste of the rest of the
cpus.
We are using the following services (imap, pop3, lmtp, sieve)
One thought that comes to mind is to run different master processes
which do one service at a time.
I am thinking on consolidating into
1. cyrus-master-main (running imap/sieve)
2. cyrus-master-pop3 (running pop3)
3. cyrus-master-lmtp (running lmtp)
Does this makes any sense?
Would this balance the usage of the CPUs.
If yes, I will post the config files for inspection.
best regards
Atif
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