Hello,
(Sorry if I'm writing to the wrong list or asking something that has been
asked before. I just haven't found any good solution to this. Please let
me know if the message should go elsewhere.)
I'm having problems with Apache 1.3.20's memory usage on Solaris 7 08/99.
For every VirtualHost I add, Apache seems to use around 24 kilobytes more
memory. This is really too much, considering I need to use n * 1000
VirtualHosts and need to have a fair amount of servers processes running to
scale well. With 1087 VirtualHosts and 150 processes running, each httpd
has allocated 13448 KB memory according to memps (a Sun memtool
program):
PID Size Resident Shared Private Process
13341 13448k 13432k 1840k 11592k /usr/local/apache/bin/httpd
13352 13448k 13432k 1840k 11592k /usr/local/apache/bin/httpd
13345 13448k 13432k 1840k 11592k /usr/local/apache/bin/httpd
13358 13448k 13432k 1840k 11592k /usr/local/apache/bin/httpd
13354 13448k 13432k 1840k 11592k /usr/local/apache/bin/httpd
13356 13448k 13432k 1840k 11592k /usr/local/apache/bin/httpd
13360 13448k 13432k 1840k 11592k /usr/local/apache/bin/httpd
(..)
That means I need ~ 1970 MB memory for my current setup, and I've just
got started. :-)
Now, looking at the memory structure of one of these processes (while
running), I can see:
# /usr/proc/bin/pmap -x 13356
13356: /usr/local/apache/bin/httpd
Address Kbytes Resident Shared Private Permissions Mapped File
00010000 472 464 376 88 read/exec httpd
00094000 32 32 - 32 read/write/exec httpd
0009C000 11288 11280 24 11256 read/write/exec [ heap ]
FF180000 664 664 656 8 read/exec libc.so.1
FF234000 32 32 8 24 read/write/exec libc.so.1
FF23C000 8 8 - 8 read/write/exec [ anon ]
FF250000 48 48 16 32 read/write/shared [ anon ]
FF260000 16 16 8 8 read/exec
nss_files.so.1
FF272000 8 8 - 8 read/write/exec
nss_files.so.1
FF280000 520 520 440 80 read/exec libnsl.so.1
FF310000 40 40 - 40 read/write/exec libnsl.so.1
FF31A000 32 32 - 32 read/write/exec [ anon ]
FF330000 16 16 8 8 read/exec libc_psr.so.1
FF340000 16 16 8 8 read/exec libmp.so.2
FF352000 8 8 - 8 read/write/exec libmp.so.2
FF370000 8 8 - 8 read/write/exec [ anon ]
FF380000 32 32 24 8 read/exec
libsocket.so.1
FF396000 16 16 8 8 read/write/exec
libsocket.so.1
FF3A0000 8 8 - 8 read/exec libdl.so.1
FF3B0000 128 128 120 8 read/exec ld.so.1
FF3DE000 16 16 - 16 read/write/exec ld.so.1
FFBE6000 40 40 - 40 read/write/exec [ stack ]
-------- ------ ------ ------ ------
total Kb 13448 13432 1696 11736
It's the heap that's killing me. How can I reduce Apache's heap memory
usage in Solaris? I've tried using a shared memory scoreboard, with/without
DSO support (-DNO_DL_NEEDED, --disable-module=so), using -Os
optimization with gcc, disabled all extra (I can do without about 10 of
the standard ones) & external modules etc. With no luck. Generally, I've
compiled Apache with (+ -Os added to CFLAGS):
# ./configure --enable-module=all --disable-module=auth_db \
--disable-module=so
# make
And I'm using gcc 2.95.3 (from www.sunfreeware.com) and GNU ld 2.11.2.
I've also tried gcc 2.95.2 19991024 (release) and GNU ld 2.9.1. With not
much difference, heap is over 11 MB any way I do this. Also with older
versions of Apache, I've tried 1.3.12 and 1.3.14 too.
Any tips on this? Is the answer Apache 2? :-)
Cheers,
--
Anders.
