nobaloney
NoBaloney Internet Svcs - In Memoriam †
I'm going to use these numbers on the system hosting mail for nobaloney.net today, and see how it goes.
Do you think the standard should be based on what works on a dual-core machine?
Jeff
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- Thread starter moshem
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Do you think the standard should be based on what works on a dual-core machine?
Jeff
tillo
Verified User
I think that the best would be to write a dynamic function that does, for linux:
deliver_queue_load_max = number_of_cpu * 5
queue_only_load = number_of_cpu * 7.5
For BSD (because IOwait processes are not counted):
deliver_queue_load_max = number_of_cpu * 3
queue_only_load = number_of_cpu * 4.5
Of course number_of_cpu should be retrieved from /proc/cpuinfo on linux, I don't remember about BSD.
I don't know the best way to do that in exim but I guess I can find out if needed.
(are we still OT? oh yes, we are
)
deliver_queue_load_max = number_of_cpu * 5
queue_only_load = number_of_cpu * 7.5
For BSD (because IOwait processes are not counted):
deliver_queue_load_max = number_of_cpu * 3
queue_only_load = number_of_cpu * 4.5
Of course number_of_cpu should be retrieved from /proc/cpuinfo on linux, I don't remember about BSD.
I don't know the best way to do that in exim but I guess I can find out if needed.
(are we still OT? oh yes, we are
)
nobaloney
NoBaloney Internet Svcs - In Memoriam †
Yes, we are, but I looked, and I don't see a good place to break the topics. Probably my fault because of how I originally responded to you.
Exim isn't going to be able to do that; in my next master I can make it a variable (there are already a lot of variables in my next master), but then John will have to figure out how to properly install from my master
.
And then there's another issue: does Linux know the difference between multiple cores and multiple threads?
BTW, the machine hosting nobaloney.net has only one core; but it is multi-threaded. We've got some old Cobalt RaQ550s running CentOS on single-threaded processes; they make nice dedicated reseller machines; nice dedicated single-domain machines.
But now we're getting even more off-topic.
Jeff
Exim isn't going to be able to do that; in my next master I can make it a variable (there are already a lot of variables in my next master), but then John will have to figure out how to properly install from my master
.And then there's another issue: does Linux know the difference between multiple cores and multiple threads?
BTW, the machine hosting nobaloney.net has only one core; but it is multi-threaded. We've got some old Cobalt RaQ550s running CentOS on single-threaded processes; they make nice dedicated reseller machines; nice dedicated single-domain machines.
But now we're getting even more off-topic.
Jeff
tillo
Verified User
If by "multi-threaded" you mean a CPU with HyperThreading, that's a P4 feature not PIII (as RaQ 500 machines apparently have).
Anyway, FreeBSD 4.x (the last version I used) didn't support HT but linux does for sure since version 2.6.
Real multiple CPUs, multiple cores or emulation of multiple CPUs (HT) are all shown the same way in /proc/cpuinfo, this command will tell the exact number of parallel processing allowed:
I don't know if modern FreeBSD have linux proc emulation by default, I remember FreeBSD 4.x having it as an option.
Anyway, FreeBSD 4.x (the last version I used) didn't support HT but linux does for sure since version 2.6.
Real multiple CPUs, multiple cores or emulation of multiple CPUs (HT) are all shown the same way in /proc/cpuinfo, this command will tell the exact number of parallel processing allowed:
Code:
grep -c ^processor /proc/cpuinfoI don't know if modern FreeBSD have linux proc emulation by default, I remember FreeBSD 4.x having it as an option.