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Jurgen Simons
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 Posted: Wed Oct 22, 2003 3:01 am Post subject: maximum number of threads |
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I would like to know how many threads can run on a Indy TCP/IP Server. How
many threads can run without problems on a P4 2.4Ghz with 1GB RAM?
Thanks!
Jurgen Simons
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Remy Lebeau (TeamB)
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| Posted: Wed Oct 22, 2003 3:20 am Post subject: Re: maximum number of threads |
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"Jurgen Simons" <jsimons (AT) yucom (DOT) be> wrote
| Quote: | I would like to know how many threads can run on a Indy TCP/IP Server.
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Hundreds certainly, possibly thousands. Depending on the actual OS you are
using, the OS itself will start to buckle after a couple of thousand.
Indy 10 will include support for Fibers, which will significantly reduce the
number of threads needed. Multiple Fibers can run in the context of a
single thread, and by the time Indy 10 is released, the Fiber support will
be optimized to the point where you will hardly see any performance
difference between using threads and using fibers for handling client
connections.
| Quote: | How many threads can run without problems on a P4 2.4Ghz with 1GB RAM?
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That is an OS issue, not an Indy issue. Indy will keep making threads until
the OS and memory can't make anymore. Newer OSs have a higher limit than
older OSes over how many threads can be created.
Gambit
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Martin James
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| Posted: Wed Oct 22, 2003 3:35 am Post subject: Re: maximum number of threads |
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"Jurgen Simons" <jsimons (AT) yucom (DOT) be> wrote
| Quote: | I would like to know how many threads can run on a Indy TCP/IP Server. How
many threads can run without problems on a P4 2.4Ghz with 1GB RAM?
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Thousands can exist. Your question needs tightening up. What may be a
problem to you may not be to others. If you have thousands of clients
connected but very few are actually doing much, there should be no problem.
It all depends on the loading generated by your clients.
If you have 20 clients all doing intensive, concurrent database queries on
the TCP server, response will be slow as the CPU is shared amongst the ready
threads.
There are some issues with lots of threads. Around ~2000, the default
thread stack size has to be reduced to prevent the 2GB process virtual
address space running out. The thread stacks are given the same space as
the main thread. The default for this is 1 meg & so can be reduced greatly
without problems - it's in the linker options.
Rgds,
Martin
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Lluis Olle
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| Posted: Wed Oct 22, 2003 5:09 pm Post subject: Re: maximum number of threads |
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I think the limit comes from tha fact that in a "normal" NT environment,
your application is confined into a 2Gb address space - the other 2Gb
address space being reserved for the system itself.
But each thread you create will "eat" by default 1Mb of address space - no
matter if phisically only allocates a few Kbytes of ram. So, if your sum the
main application own memory requirements, then I doubt you can create more
than 2000 threads (because 2000 x 1Mb = 2Gb). Sure, your application will
die much before, so don't count on having more than 1500 threads active for
one single process.
"Jurgen Simons" <jsimons (AT) yucom (DOT) be> escribió en el mensaje
news:3f95f334$1 (AT) newsgroups (DOT) borland.com...
| Quote: | I would like to know how many threads can run on a Indy TCP/IP Server. How
many threads can run without problems on a P4 2.4Ghz with 1GB RAM?
Thanks!
Jurgen Simons
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Dmitry
Guest
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| Posted: Wed Oct 22, 2003 5:10 pm Post subject: Re: maximum number of threads |
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I'm creating maximum 1600 threads in Windows XP!
If more - program will crash! =(
"Lluis Olle" <llob (AT) menta (DOT) net> ÓÏÏÂÝÉÌ/ÓÏÏÂÝÉÌÁ × ÎÏ×ÏÓÔÑÈ ÓÌÅÄÕÀÝÅÅ:
news:3f96b9d0 (AT) newsgroups (DOT) borland.com...
| Quote: | I think the limit comes from tha fact that in a "normal" NT environment,
your application is confined into a 2Gb address space - the other 2Gb
address space being reserved for the system itself.
But each thread you create will "eat" by default 1Mb of address space - no
matter if phisically only allocates a few Kbytes of ram. So, if your sum
the
main application own memory requirements, then I doubt you can create more
than 2000 threads (because 2000 x 1Mb = 2Gb). Sure, your application will
die much before, so don't count on having more than 1500 threads active
for
one single process.
"Jurgen Simons" <jsimons (AT) yucom (DOT) be> escribió en el mensaje
news:3f95f334$1 (AT) newsgroups (DOT) borland.com...
I would like to know how many threads can run on a Indy TCP/IP Server.
How
many threads can run without problems on a P4 2.4Ghz with 1GB RAM?
Thanks!
Jurgen Simons
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Chad Z. Hower aka Kudzu
Guest
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| Posted: Thu Oct 23, 2003 4:39 pm Post subject: Re: maximum number of threads |
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"Lluis Olle" <llob (AT) menta (DOT) net> wrote in
news:3f96b9d0 (AT) newsgroups (DOT) borland.com:
| Quote: | I think the limit comes from tha fact that in a "normal" NT environment,
your application is confined into a 2Gb address space - the other 2Gb
address space being reserved for the system itself.
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Correct.
| Quote: | But each thread you create will "eat" by default 1Mb of address space -
no matter if phisically only allocates a few Kbytes of ram. So, if your
sum the main application own memory requirements, then I doubt you can
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You can adjust down the reserved space on XP (and maybe 2000) on a per thread
basis. On others you can adjust it only globally.
| Quote: | application will die much before, so don't count on having more than
1500 threads active for one single process.
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Correct. Really at 1,000 or so you should think about a different structure
anyways (other than 1 thread per connection).
--
Chad Z. Hower (a.k.a. Kudzu) - http://www.hower.org/Kudzu/
"Programming is an art form that fights back"
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