The default of 25 threads. 8MB * 25 = 200MB. Very helpful. Stack size.
Doh. Why didn't I think of that. This should of course affect Prefork as
well. The stack size must be less than 10MB with it. Does Apache change
the stack size with Prefork? Or, is Linux handling the VM needs differently?
I lowered ThreadStackSize down to 2MB from 10MB. How low can I go here
without any programmatic modules (PHP, etc...) loaded?
Thanks...
StartServers 3
MaxClients 300
MinSpareThreads 75
MaxSpareThreads 250
ThreadsPerChild 25
MaxRequestsPerChild 0
[EMAIL PROTECTED] [/usr/local/apache/conf/extra]# ulimit -a
core file size (blocks, -c) 0
data seg size (kbytes, -d) unlimited
file size (blocks, -f) unlimited
pending signals (-i) 1024
max locked memory (kbytes, -l) 32
max memory size (kbytes, -m) unlimited
open files (-n) 1024
pipe size (512 bytes, -p) 8
POSIX message queues (bytes, -q) 819200
stack size (kbytes, -s) 10240
cpu time (seconds, -t) unlimited
max user processes (-u) 71680
virtual memory (kbytes, -v) unlimited
file locks (-x) unlimited
# 10MB stack size
[EMAIL PROTECTED] [/usr/local/apache/conf/extra]# pmap -x 9956
9956: /usr/local/apache/bin/httpd -k start -DSSL
Address Kbytes RSS Anon Locked Mode Mapping
08048000 544 - - - r-x-- httpd
080d0000 16 - - - rw--- httpd
080d4000 1232 - - - rw--- [ anon ]
a6d7f000 16 - - - r-x-- libnss_dns-2.3.4.so
a6d83000 4 - - - r---- libnss_dns-2.3.4.so
a6d84000 4 - - - rw--- libnss_dns-2.3.4.so
a6d85000 36 - - - r-x-- libgcc_s-3.4.6-20060404.so.1
a6d8e000 4 - - - rw--- libgcc_s-3.4.6-20060404.so.1
a6d9a000 4 - - - ----- [ anon ]
a6d9b000 10240 - - - rw--- [ anon ]
a779b000 4 - - - ----- [ anon ]
a779c000 10240 - - - rw--- [ anon ]
a819c000 4 - - - ----- [ anon ]
a819d000 10240 - - - rw--- [ anon ]
a8b9d000 4 - - - ----- [ anon ]
a8b9e000 10240 - - - rw--- [ anon ]
a959e000 4 - - - ----- [ anon ]
a959f000 10240 - - - rw--- [ anon ]
a9f9f000 4 - - - ----- [ anon ]
a9fa0000 10240 - - - rw--- [ anon ]
aa9a0000 4 - - - ----- [ anon ]
aa9a1000 10240 - - - rw--- [ anon ]
ab3a1000 4 - - - ----- [ anon ]
ab3a2000 10240 - - - rw--- [ anon ]
abda2000 4 - - - ----- [ anon ]
abda3000 10240 - - - rw--- [ anon ]
ac7a3000 4 - - - ----- [ anon ]
ac7a4000 10240 - - - rw--- [ anon ]
ad1a4000 4 - - - ----- [ anon ]
ad1a5000 10240 - - - rw--- [ anon ]
adba5000 4 - - - ----- [ anon ]
adba6000 10240 - - - rw--- [ anon ]
ae5a6000 4 - - - ----- [ anon ]
ae5a7000 10240 - - - rw--- [ anon ]
aefa7000 4 - - - ----- [ anon ]
aefa8000 10240 - - - rw--- [ anon ]
af9a8000 4 - - - ----- [ anon ]
af9a9000 10240 - - - rw--- [ anon ]
b03a9000 4 - - - ----- [ anon ]
b03aa000 10240 - - - rw--- [ anon ]
b0daa000 4 - - - ----- [ anon ]
b0dab000 10240 - - - rw--- [ anon ]
b17ab000 4 - - - ----- [ anon ]
b17ac000 10240 - - - rw--- [ anon ]
b21ac000 4 - - - ----- [ anon ]
b21ad000 10240 - - - rw--- [ anon ]
b2bad000 4 - - - ----- [ anon ]
b2bae000 10240 - - - rw--- [ anon ]
b35ae000 4 - - - ----- [ anon ]
b35af000 10240 - - - rw--- [ anon ]
b3faf000 4 - - - ----- [ anon ]
b3fb0000 10240 - - - rw--- [ anon ]
b49b0000 4 - - - ----- [ anon ]
b49b1000 10240 - - - rw--- [ anon ]
b53b1000 4 - - - ----- [ anon ]
b53b2000 10240 - - - rw--- [ anon ]
b5db2000 4 - - - ----- [ anon ]
b5db3000 10240 - - - rw--- [ anon ]
b67b3000 4 - - - ----- [ anon ]
b67b4000 10240 - - - rw--- [ anon ]
b71b4000 4 - - - ----- [ anon ]
b71b5000 10240 - - - rw--- [ anon ]
b7bb5000 228 - - - rw-s- [ anon ]
b7bee000 36 - - - r-x-- libnss_files-2.3.4.so
b7bf7000 4 - - - r---- libnss_files-2.3.4.so
b7bf8000 4 - - - rw--- libnss_files-2.3.4.so
b7c04000 8 - - - rw--- [ anon ]
b7c06000 1176 - - - r-x-- libc-2.3.4.so
b7d2c000 8 - - - r---- libc-2.3.4.so
b7d2e000 8 - - - rw--- libc-2.3.4.so
b7d30000 8 - - - rw--- [ anon ]
b7d32000 8 - - - r-x-- libdl-2.3.4.so
b7d34000 4 - - - r---- libdl-2.3.4.so
b7d35000 4 - - - rw--- libdl-2.3.4.so
b7d36000 56 - - - r-x-- libpthread-2.3.4.so
b7d44000 4 - - - r---- libpthread-2.3.4.so
b7d45000 4 - - - rw--- libpthread-2.3.4.so
b7d46000 8 - - - rw--- [ anon ]
b7d48000 20 - - - r-x-- libcrypt-2.3.4.so
b7d4d000 4 - - - r---- libcrypt-2.3.4.so
b7d4e000 4 - - - rw--- libcrypt-2.3.4.so
b7d4f000 156 - - - rw--- [ anon ]
b7d76000 32 - - - r-x-- librt-2.3.4.so
b7d7e000 4 - - - r---- librt-2.3.4.so
b7d7f000 4 - - - rw--- librt-2.3.4.so
b7d80000 44 - - - rw--- [ anon ]
b7d8b000 8 - - - r-x-- libuuid.so.1.2
b7d8d000 4 - - - rw--- libuuid.so.1.2
b7d8e000 112 - - - r-x-- libapr-1.so.0.2.11
b7daa000 4 - - - rw--- libapr-1.so.0.2.11
b7dab000 112 - - - r-x-- libexpat.so.0.5.0
b7dc7000 8 - - - rw--- libexpat.so.0.5.0
b7dc9000 68 - - - r-x-- libaprutil-1.so.0.2.11
b7dda000 4 - - - rw--- libaprutil-1.so.0.2.11
b7ddb000 132 - - - r-x-- libm-2.3.4.so
b7dfc000 4 - - - r---- libm-2.3.4.so
b7dfd000 4 - - - rw--- libm-2.3.4.so
b7dfe000 60 - - - r-x-- libz.so.1.2.1.2
b7e0d000 4 - - - rw--- libz.so.1.2.1.2
b7e0e000 4 - - - rw--- [ anon ]
b7e0f000 60 - - - r-x-- libresolv-2.3.4.so
b7e1e000 4 - - - r---- libresolv-2.3.4.so
b7e1f000 4 - - - rw--- libresolv-2.3.4.so
b7e20000 8 - - - rw--- [ anon ]
b7e22000 128 - - - r-x-- libk5crypto.so.3.0
b7e42000 4 - - - rw--- libk5crypto.so.3.0
b7e43000 8 - - - r-x-- libcom_err.so.2.1
b7e45000 4 - - - rw--- libcom_err.so.2.1
b7e46000 396 - - - r-x-- libkrb5.so.3.2
b7ea9000 8 - - - rw--- libkrb5.so.3.2
b7eab000 76 - - - r-x-- libgssapi_krb5.so.2.2
b7ebe000 4 - - - rw--- libgssapi_krb5.so.2.2
b7ebf000 848 - - - r-x-- libcrypto.so.0.9.7a
b7f93000 72 - - - rw--- libcrypto.so.0.9.7a
b7fa5000 16 - - - rw--- [ anon ]
b7fa9000 196 - - - r-x-- libssl.so.0.9.7a
b7fda000 12 - - - rw--- libssl.so.0.9.7a
b7fe4000 4 - - - r-x-- mod_bwlimited.so
b7fe5000 4 - - - rw--- mod_bwlimited.so
b7fe6000 4 - - - r-x-- mod_auth_passthrough.so
b7fe7000 4 - - - rw--- mod_auth_passthrough.so
b7fe8000 88 - - - r-x-- ld-2.3.4.so
b7ffe000 4 - - - r---- ld-2.3.4.so
b7fff000 4 - - - rw--- ld-2.3.4.so
bfff9000 20 - - - rw--- [ stack ]
ffffe000 4 - - - ----- [ anon ]
-------- ------- ------- ------- -------
total kB 282792 - - -
# 2MB stack size
[EMAIL PROTECTED] [/usr/local/apache/conf/extra]# pmap -x 23783
23783: /usr/local/apache/bin/httpd -k start -DSSL
Address Kbytes RSS Anon Locked Mode Mapping
08048000 544 - - - r-x-- httpd
080d0000 16 - - - rw--- httpd
080d4000 964 - - - rw--- [ anon ]
b4585000 36 - - - r-x-- libgcc_s-3.4.6-20060404.so.1
b458e000 4 - - - rw--- libgcc_s-3.4.6-20060404.so.1
b459a000 4 - - - ----- [ anon ]
b459b000 2048 - - - rw--- [ anon ]
b479b000 4 - - - ----- [ anon ]
b479c000 2048 - - - rw--- [ anon ]
b499c000 4 - - - ----- [ anon ]
b499d000 2048 - - - rw--- [ anon ]
b4b9d000 4 - - - ----- [ anon ]
b4b9e000 2048 - - - rw--- [ anon ]
b4d9e000 4 - - - ----- [ anon ]
b4d9f000 2048 - - - rw--- [ anon ]
b4f9f000 4 - - - ----- [ anon ]
b4fa0000 2048 - - - rw--- [ anon ]
b51a0000 4 - - - ----- [ anon ]
b51a1000 2048 - - - rw--- [ anon ]
b53a1000 4 - - - ----- [ anon ]
b53a2000 2048 - - - rw--- [ anon ]
b55a2000 4 - - - ----- [ anon ]
b55a3000 2048 - - - rw--- [ anon ]
b57a3000 4 - - - ----- [ anon ]
b57a4000 2048 - - - rw--- [ anon ]
b59a4000 4 - - - ----- [ anon ]
b59a5000 2048 - - - rw--- [ anon ]
b5ba5000 4 - - - ----- [ anon ]
b5ba6000 2048 - - - rw--- [ anon ]
b5da6000 4 - - - ----- [ anon ]
b5da7000 2048 - - - rw--- [ anon ]
b5fa7000 4 - - - ----- [ anon ]
b5fa8000 2048 - - - rw--- [ anon ]
b61a8000 4 - - - ----- [ anon ]
b61a9000 2048 - - - rw--- [ anon ]
b63a9000 4 - - - ----- [ anon ]
b63aa000 2048 - - - rw--- [ anon ]
b65aa000 4 - - - ----- [ anon ]
b65ab000 2048 - - - rw--- [ anon ]
b67ab000 4 - - - ----- [ anon ]
b67ac000 2048 - - - rw--- [ anon ]
b69ac000 4 - - - ----- [ anon ]
b69ad000 2048 - - - rw--- [ anon ]
b6bad000 4 - - - ----- [ anon ]
b6bae000 2048 - - - rw--- [ anon ]
b6dae000 4 - - - ----- [ anon ]
b6daf000 2048 - - - rw--- [ anon ]
b6faf000 4 - - - ----- [ anon ]
b6fb0000 2048 - - - rw--- [ anon ]
b71b0000 4 - - - ----- [ anon ]
b71b1000 2048 - - - rw--- [ anon ]
b73b1000 4 - - - ----- [ anon ]
b73b2000 2048 - - - rw--- [ anon ]
b75b2000 4 - - - ----- [ anon ]
b75b3000 2048 - - - rw--- [ anon ]
b77b3000 4 - - - ----- [ anon ]
b77b4000 2048 - - - rw--- [ anon ]
b79b4000 4 - - - ----- [ anon ]
b79b5000 2048 - - - rw--- [ anon ]
b7bb5000 228 - - - rw-s- [ anon ]
b7bee000 36 - - - r-x-- libnss_files-2.3.4.so
b7bf7000 4 - - - r---- libnss_files-2.3.4.so
b7bf8000 4 - - - rw--- libnss_files-2.3.4.so
b7c04000 8 - - - rw--- [ anon ]
b7c06000 1176 - - - r-x-- libc-2.3.4.so
b7d2c000 8 - - - r---- libc-2.3.4.so
b7d2e000 8 - - - rw--- libc-2.3.4.so
b7d30000 8 - - - rw--- [ anon ]
b7d32000 8 - - - r-x-- libdl-2.3.4.so
b7d34000 4 - - - r---- libdl-2.3.4.so
b7d35000 4 - - - rw--- libdl-2.3.4.so
b7d36000 56 - - - r-x-- libpthread-2.3.4.so
b7d44000 4 - - - r---- libpthread-2.3.4.so
b7d45000 4 - - - rw--- libpthread-2.3.4.so
b7d46000 8 - - - rw--- [ anon ]
b7d48000 20 - - - r-x-- libcrypt-2.3.4.so
b7d4d000 4 - - - r---- libcrypt-2.3.4.so
b7d4e000 4 - - - rw--- libcrypt-2.3.4.so
b7d4f000 156 - - - rw--- [ anon ]
b7d76000 32 - - - r-x-- librt-2.3.4.so
b7d7e000 4 - - - r---- librt-2.3.4.so
b7d7f000 4 - - - rw--- librt-2.3.4.so
b7d80000 44 - - - rw--- [ anon ]
b7d8b000 8 - - - r-x-- libuuid.so.1.2
b7d8d000 4 - - - rw--- libuuid.so.1.2
b7d8e000 112 - - - r-x-- libapr-1.so.0.2.11
b7daa000 4 - - - rw--- libapr-1.so.0.2.11
b7dab000 112 - - - r-x-- libexpat.so.0.5.0
b7dc7000 8 - - - rw--- libexpat.so.0.5.0
b7dc9000 68 - - - r-x-- libaprutil-1.so.0.2.11
b7dda000 4 - - - rw--- libaprutil-1.so.0.2.11
b7ddb000 132 - - - r-x-- libm-2.3.4.so
b7dfc000 4 - - - r---- libm-2.3.4.so
b7dfd000 4 - - - rw--- libm-2.3.4.so
b7dfe000 60 - - - r-x-- libz.so.1.2.1.2
b7e0d000 4 - - - rw--- libz.so.1.2.1.2
b7e0e000 4 - - - rw--- [ anon ]
b7e0f000 60 - - - r-x-- libresolv-2.3.4.so
b7e1e000 4 - - - r---- libresolv-2.3.4.so
b7e1f000 4 - - - rw--- libresolv-2.3.4.so
b7e20000 8 - - - rw--- [ anon ]
b7e22000 128 - - - r-x-- libk5crypto.so.3.0
b7e42000 4 - - - rw--- libk5crypto.so.3.0
b7e43000 8 - - - r-x-- libcom_err.so.2.1
b7e45000 4 - - - rw--- libcom_err.so.2.1
b7e46000 396 - - - r-x-- libkrb5.so.3.2
b7ea9000 8 - - - rw--- libkrb5.so.3.2
b7eab000 76 - - - r-x-- libgssapi_krb5.so.2.2
b7ebe000 4 - - - rw--- libgssapi_krb5.so.2.2
b7ebf000 848 - - - r-x-- libcrypto.so.0.9.7a
b7f93000 72 - - - rw--- libcrypto.so.0.9.7a
b7fa5000 16 - - - rw--- [ anon ]
b7fa9000 196 - - - r-x-- libssl.so.0.9.7a
b7fda000 12 - - - rw--- libssl.so.0.9.7a
b7fe4000 4 - - - r-x-- mod_bwlimited.so
b7fe5000 4 - - - rw--- mod_bwlimited.so
b7fe6000 4 - - - r-x-- mod_auth_passthrough.so
b7fe7000 4 - - - rw--- mod_auth_passthrough.so
b7fe8000 88 - - - r-x-- ld-2.3.4.so
b7ffe000 4 - - - r---- ld-2.3.4.so
b7fff000 4 - - - rw--- ld-2.3.4.so
bfff9000 20 - - - rw--- [ stack ]
ffffe000 4 - - - ----- [ anon ]
-------- ------- ------- ------- -------
total kB 61316 - - -
Ruediger Pluem wrote:
What is your setting for ThreadsPerChild?
On my Linux each thread consumes 8MB of virtual memory (I assume for stack and
other
thread private data) as shown by pmap. This can sum up to a large amount of
memory.
Regards
Rüdiger
On 10/21/2007 12:29 PM, Apache Dev wrote:
I tried asking this on the users mailing list. But, I think it is beyond
that list.
There appears to be a significant difference between Apache 2.2 MPM
Worker and MPM Perfork virtual memory usage. As well as between Apache
2.2 MPM Worker and Apache 1.3 virtual memory usage. This can become an
issue in a VPS (virtual private server) environment where resources are
more constrained. Privvmpages is limited in this environment. The impact
here is that some VPS users simply cannot run the Worker MPM. Which is
unfortunate.
I am seeing 280MB vs 5.8MB of VM usage per process. You could argue that
worker is supposed to use more virtual memory, as running multiple
threads per process it actually uses less. But, that is not the case.
Total VPS privvmpages is 2.1GB vs 358MB. What is really interesting here
is why is it so much higher. You would expect some increase but it looks
like most (if not all) of the virtual memory of each of the 7 worker
processes is not shared. 7 * 280MB = 2GB. Which means it can't be code.
I don't see how it could be this much code anyway. So then what is it?
(Conversely most of the 2.2 perfork virtual memory is shared code. 150 *
5.8MB = 850MB,which is more than 358MB for the entire VPS.) Is the code
building some kind of large local process database? Anyway to turn it off?
Note I do not have PHP or any other programmatic modules loaded. See
below for configure info.
Thanks...
