On Tue, Mar 20, 2001 at 10:09:09AM -0800, Alfred Perlstein scribbled:
| * Michael C . Wu <[EMAIL PROTECTED]> [010320 10:01] wrote:
| > MRTG Graph at
| > http://zoonews.ee.ntu.edu.tw/mrtg/zoo.html
| >
| > |
| > | FreeBSD zoo.ee.ntu.edu.tw 4.2-STABLE FreeBSD 4.2-STABLE
| > | #0: Tue Mar 20 11:10:46 CST 2001 root@:/usr/src/sys/compile/SimFarm i386
| > |
| > | | > system stats at
| > | | > http://zoo.ee.ntu.edu.tw/~keichii/
| > | md0/MFS is used for caching the articles that BBS users read.
| > | They often read the same articles over and over again,
| > | and we find that a 128MB MFS/md0 will have 70% hitrate
| > |
| > | When our MFS/md0 fills up after long usage, the box easily
| > | dies. (We crontab clean the mfs, but sometimes the load
| > | shoots up for no reason and is not able to clean the mfs in time.)
| > | If we dont do this cache, the data for the bulletin boards
| > |
| >
| > Another problem is that we have around 4000+ processes accessing
| > lots of SHM at the same time..
|
| How much SHM? Like, what's the combined size of all segments in
| the system? You can make SHM non-pageable which results in a lot
| of saved memory for attached processes.
|
ipcs -b
Shared Memory:
T ID KEY MODE OWNER GROUP SEGSZ
m 65536 1304 --rw------- bbs bbs 131076
m 65537 1217 --rw------- bbs wheel 1633728
m 65538 1215 --rw------- bbs wheel 768016
m 65539 1219 --rw------- bbs bbs 2065956
m 65540 1111 --rw------- bbs bbs 12
m 65541 1302 --rw------- bbs bbs 40016
m 65542 1303 --rw------- bbs bbs 40016
m 65543 1201 --rw------- bbs bbs 33328
m 65544 1301 --rw------- bbs bbs 33328
VM_KMEM_SIZE_MAX
When we raise this variable, the system dies easily, but
on a similiarly configured system (bbs.kkcity.com.tw) at similiar load,
It helps a lot to keep the system stable.
We have a hashd daemon that uses 4300*2 unix domain sockets written
in pthreads. There are eight of these daemons each serving about
500 bbsd's.
| Revision 1.3.2.3 / (download) - annotate - [select for diffs], Sun Dec 17 02:05:41
|2000 UTC (3 months ago) by alfred
| Branch: RELENG_4
| Changes since 1.3.2.2: +37 -32 lines
| Diff to previous 1.3.2.2 (colored) to branchpoint 1.3 (colored) next main 1.4
|(colored)
|
| MFC: phys_pager fix for multiple segments
|
| Then set kern.ipc.shm_use_phys=1
O.K.
| > The *UGLY* source code for the BBS is at
| > http://zoo.ee.ntu.edu.tw/~keichii/zoo_bbsd_src.tgz
|
| tis ok, maybe later... though :)
Someone asked me in private for this. :)
--
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