Tuning freeradius memory usage for small footprint machines
Peter Thomas (pethoma2)
pethoma2 at cisco.com
Sat May 25 01:46:35 UTC 2024
Thanks for the responses. I did some digging around and this is what I found.
While running by disabling threads (-t) freeradius uses around 5MB while the normal mode uses about 43MB. In normal mode, freeradius seems to use a min of 9 threads even if I use extremely conservative server settings like start_servers = 1 max_servers = 1 min_spare_servers = 0 max_spare_servers = 0
Also, I noticed that in normal mode, a large anonymous section of memory (about 38M) is allocated.
cat /proc/25923/maps (full output given below)
b4720000-b6b69000 rw-p 00000000 00:00 0
while in -t mode, this section is very small (< 1M)
cat /proc/17492/maps
b6ac7000-b6ae6000 rw-p 00000000 00:00 0
Any thoughts/pointers to figure out where this large memory is allocated would be helpful.
Disable threads (-t)
================
cat /proc/<pid>/status
VmPeak: 5644 kB
VmSize: 5644 kB
VmLck: 0 kB
VmPin: 0 kB
VmHWM: 3744 kB
VmRSS: 3744 kB
VmData: 508 kB
VmStk: 132 kB
VmExe: 416 kB
VmLib: 4412 kB
VmPTE: 12 kB
VmPMD: 0 kB
VmSwap: 0 kB
Threads: 1
cat /proc/17492/maps
00481000-004e9000 r-xp 00000000 00:02 1530 /usr/sbin/radiusd
004f8000-004fa000 r--p 00067000 00:02 1530 /usr/sbin/radiusd
004fa000-004fc000 rw-p 00069000 00:02 1530 /usr/sbin/radiusd
004fc000-004fd000 rw-p 00000000 00:00 0
01bc1000-01c12000 rw-p 00000000 00:00 0 [heap]
01c12000-01c19000 rw-p 00000000 00:00 0 [heap]
b6ac7000-b6ae6000 rw-p 00000000 00:00 0
b6ae6000-b6b06000 r-xp 00000000 00:02 1306 /usr/lib/libz.so.1.2.13
b6b06000-b6b07000 r--p 00010000 00:02 1306 /usr/lib/libz.so.1.2.13
b6b07000-b6b08000 rw-p 00011000 00:02 1306 /usr/lib/libz.so.1.2.13
b6b08000-b6b4b000 r-xp 00000000 00:02 1287 /usr/lib/libpcap.so.1.10.0
b6b4b000-b6b4c000 r--p 00033000 00:02 1287 /usr/lib/libpcap.so.1.10.0
b6b4c000-b6b4d000 rw-p 00034000 00:02 1287 /usr/lib/libpcap.so.1.10.0
b6b4d000-b6b61000 r-xp 00000000 00:02 735 /lib/libcap.so.2.32
b6b61000-b6b62000 r--p 00004000 00:02 735 /lib/libcap.so.2.32
b6b62000-b6b63000 rw-p 00005000 00:02 735 /lib/libcap.so.2.32
b6b63000-b6bc9000 r-xp 00000000 00:02 1295 /usr/lib/libpcre.so.1.2.12
b6bc9000-b6bca000 r--p 00056000 00:02 1295 /usr/lib/libpcre.so.1.2.12
b6bca000-b6bcb000 rw-p 00057000 00:02 1295 /usr/lib/libpcre.so.1.2.12
b6bcb000-b6bdd000 r-xp 00000000 00:02 1216 /usr/lib/libatomic.so.1.2.0
b6bdd000-b6bde000 r--p 00002000 00:02 1216 /usr/lib/libatomic.so.1.2.0
b6bde000-b6bdf000 rw-p 00003000 00:02 1216 /usr/lib/libatomic.so.1.2.0
b6bdf000-b6be0000 rw-p 00000000 00:00 0
b6be0000-b6c4c000 r-xp 00000000 00:02 1301 /usr/lib/libssl.so.1.1
b6c4c000-b6c50000 r--p 0005c000 00:02 1301 /usr/lib/libssl.so.1.1
b6c50000-b6c52000 rw-p 00060000 00:02 1301 /usr/lib/libssl.so.1.1
b6c52000-b6e29000 r-xp 00000000 00:02 1219 /usr/lib/libcrypto.so.1.1
b6e29000-b6e3a000 r--p 001c7000 00:02 1219 /usr/lib/libcrypto.so.1.1
b6e3a000-b6e3b000 rw-p 001d8000 00:02 1219 /usr/lib/libcrypto.so.1.1
b6e3b000-b6e3d000 rw-p 00000000 00:00 0
b6e3d000-b6e80000 r-xp 00000000 00:02 1234 /usr/lib/libfreeradius-radius.so.0.0.0
b6e80000-b6e81000 r--p 00033000 00:02 1234 /usr/lib/libfreeradius-radius.so.0.0.0
b6e81000-b6e82000 rw-p 00034000 00:02 1234 /usr/lib/libfreeradius-radius.so.0.0.0
b6e82000-b6ebc000 r-xp 00000000 00:02 1236 /usr/lib/libfreeradius-server.so.0.0.0
b6ebc000-b6ebd000 r--p 0002a000 00:02 1236 /usr/lib/libfreeradius-server.so.0.0.0
b6ebd000-b6ebe000 rw-p 0002b000 00:02 1236 /usr/lib/libfreeradius-server.so.0.0.0
b6ebe000-b6f5e000 r-xp 00000000 00:02 1220 /usr/lib/libc.so
b6f6d000-b6f6f000 rw-p 0009f000 00:02 1220 /usr/lib/libc.so
b6f6f000-b6f71000 rw-p 00000000 00:00 0
beb18000-beb39000 rw-p 00000000 00:00 0 [stack]
bed9f000-beda0000 r-xp 00000000 00:00 0 [sigpage]
beda0000-beda1000 r--p 00000000 00:00 0 [vvar]
beda1000-beda2000 r-xp 00000000 00:00 0 [vdso]
ffff0000-ffff1000 r-xp 00000000 00:00 0 [vectors]
Normal mode
===========
VmPeak: 43668 kB
VmSize: 43668 kB
VmLck: 0 kB
VmPin: 0 kB
VmHWM: 38564 kB
VmRSS: 38564 kB
VmData: 38532 kB
VmStk: 132 kB
VmExe: 416 kB
VmLib: 4412 kB
VmPTE: 50 kB
VmPMD: 0 kB
VmSwap: 0 kB
Threads: 9
cat /proc/7348/maps
004e9000-00551000 r-xp 00000000 00:02 1530 /usr/sbin/radiusd
00560000-00562000 r--p 00067000 00:02 1530 /usr/sbin/radiusd
00562000-00564000 rw-p 00069000 00:02 1530 /usr/sbin/radiusd
00564000-00565000 rw-p 00000000 00:00 0
0058b000-005dc000 rw-p 00000000 00:00 0 [heap]
005dc000-005e3000 rw-p 00000000 00:00 0 [heap]
b453b000-b453d000 ---p 00000000 00:00 0
b453d000-b455e000 rw-p 00000000 00:00 0
b455e000-b4560000 ---p 00000000 00:00 0
b4560000-b4581000 rw-p 00000000 00:00 0
b4581000-b4583000 ---p 00000000 00:00 0
b4583000-b45a4000 rw-p 00000000 00:00 0
b45a4000-b45a6000 ---p 00000000 00:00 0
b45a6000-b45c7000 rw-p 00000000 00:00 0
b45c7000-b45c9000 ---p 00000000 00:00 0
b45c9000-b45ea000 rw-p 00000000 00:00 0
b45ea000-b45ec000 ---p 00000000 00:00 0
b45ec000-b460d000 rw-p 00000000 00:00 0
b460d000-b460f000 ---p 00000000 00:00 0
b460f000-b4630000 rw-p 00000000 00:00 0
b4630000-b4632000 ---p 00000000 00:00 0
b4632000-b6a7b000 rw-p 00000000 00:00 0
b6a7b000-b6a9b000 r-xp 00000000 00:02 1306 /usr/lib/libz.so.1.2.13
b6a9b000-b6a9c000 r--p 00010000 00:02 1306 /usr/lib/libz.so.1.2.13
b6a9c000-b6a9d000 rw-p 00011000 00:02 1306 /usr/lib/libz.so.1.2.13
b6a9d000-b6ae0000 r-xp 00000000 00:02 1287 /usr/lib/libpcap.so.1.10.0
b6ae0000-b6ae1000 r--p 00033000 00:02 1287 /usr/lib/libpcap.so.1.10.0
b6ae1000-b6ae2000 rw-p 00034000 00:02 1287 /usr/lib/libpcap.so.1.10.0
b6ae2000-b6af6000 r-xp 00000000 00:02 735 /lib/libcap.so.2.32
b6af6000-b6af7000 r--p 00004000 00:02 735 /lib/libcap.so.2.32
b6af7000-b6af8000 rw-p 00005000 00:02 735 /lib/libcap.so.2.32
b6af8000-b6b5e000 r-xp 00000000 00:02 1295 /usr/lib/libpcre.so.1.2.12
b6b5e000-b6b5f000 r--p 00056000 00:02 1295 /usr/lib/libpcre.so.1.2.12
b6b5f000-b6b60000 rw-p 00057000 00:02 1295 /usr/lib/libpcre.so.1.2.12
b6b60000-b6b72000 r-xp 00000000 00:02 1216 /usr/lib/libatomic.so.1.2.0
b6b72000-b6b73000 r--p 00002000 00:02 1216 /usr/lib/libatomic.so.1.2.0
b6b73000-b6b74000 rw-p 00003000 00:02 1216 /usr/lib/libatomic.so.1.2.0
b6b74000-b6b75000 rw-p 00000000 00:00 0
b6b75000-b6be1000 r-xp 00000000 00:02 1301 /usr/lib/libssl.so.1.1
b6be1000-b6be5000 r--p 0005c000 00:02 1301 /usr/lib/libssl.so.1.1
b6be5000-b6be7000 rw-p 00060000 00:02 1301 /usr/lib/libssl.so.1.1
b6be7000-b6dbe000 r-xp 00000000 00:02 1219 /usr/lib/libcrypto.so.1.1
b6dbe000-b6dcf000 r--p 001c7000 00:02 1219 /usr/lib/libcrypto.so.1.1
b6dcf000-b6dd0000 rw-p 001d8000 00:02 1219 /usr/lib/libcrypto.so.1.1
b6dd0000-b6dd2000 rw-p 00000000 00:00 0
b6dd2000-b6e15000 r-xp 00000000 00:02 1234 /usr/lib/libfreeradius-radius.so.0.0.0
b6e15000-b6e16000 r--p 00033000 00:02 1234 /usr/lib/libfreeradius-radius.so.0.0.0
b6e16000-b6e17000 rw-p 00034000 00:02 1234 /usr/lib/libfreeradius-radius.so.0.0.0
b6e17000-b6e51000 r-xp 00000000 00:02 1236 /usr/lib/libfreeradius-server.so.0.0.0
b6e51000-b6e52000 r--p 0002a000 00:02 1236 /usr/lib/libfreeradius-server.so.0.0.0
b6e52000-b6e53000 rw-p 0002b000 00:02 1236 /usr/lib/libfreeradius-server.so.0.0.0
b6e53000-b6ef3000 r-xp 00000000 00:02 1220 /usr/lib/libc.so
b6f02000-b6f04000 rw-p 0009f000 00:02 1220 /usr/lib/libc.so
b6f04000-b6f06000 rw-p 00000000 00:00 0
beb61000-beb82000 rw-p 00000000 00:00 0 [stack]
befb8000-befb9000 r-xp 00000000 00:00 0 [sigpage]
befb9000-befba000 r--p 00000000 00:00 0 [vvar]
befba000-befbb000 r-xp 00000000 00:00 0 [vdso]
ffff0000-ffff1000 r-xp 00000000 00:00 0 [vectors]
________________________________
From: Arran Cudbard-Bell <a.cudbardb at freeradius.org>
Sent: Wednesday, May 22, 2024 5:33 PM
To: FreeRadius users mailing list <freeradius-users at lists.freeradius.org>
Cc: Peter Thomas (pethoma2) <pethoma2 at cisco.com>
Subject: Re: Tuning freeradius memory usage for small footprint machines
> On May 22, 2024, at 18:34, Alan DeKok <aland at deployingradius.com> wrote:
>
> On May 22, 2024, at 6:23 PM, Peter Thomas (pethoma2) via Freeradius-Users <freeradius-users at lists.freeradius.org> wrote:
>>
>> I'm working on setting up FreeRADIUS on some pretty small servers with limited memory. I was wondering if anyone here has tips or tricks for reducing the memory footprint of FreeRADIUS. Are there any config tweaks to lower memory usage? I am running version 3.2.3 and the servers have about 256MB of RAM.
>
> Compared to things like browsers, FreeRADIUS use zero memory.
>
> The main way to lower memory is to disable all modules which aren't being used. After that, all of the memory is being used for the functionality you need.
--without-openssl would probably help too, otherwise, yes, most of the optional memory usage is in the modules, which are only loaded when they're explicitly enabled.
-Arran
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