On 2018-01-08 13:39, John Baldwin wrote:
On Tuesday, November 28, 2017 02:46:03 PM Michael Jung wrote:

I've recently up'd my processor count on our poudriere box and have
started noticing the error
"witness_lock_list_get: witness exhausted" on the console.  The kernel
*DOES NOT* crash but I
thought the report may be useful to someone.

$ uname -a
FreeBSD poudriere 12.0-CURRENT FreeBSD 12.0-CURRENT #1 r325999: Sun Nov
19 18:41:20 EST 2017
mikej@poudriere:/usr/obj/usr/src/amd64.amd64/sys/GENERIC  amd64

The machine is pretty busy running four poudriere build instances.

last pid: 76584;  load averages: 115.07, 115.96, 98.30

                                      up 6+07:32:59  14:44:03
763 processes: 117 running, 581 sleeping, 2 zombie, 63 lock
CPU: 59.0% user,  0.0% nice, 40.7% system,  0.1% interrupt,  0.1% idle
Mem: 12G Active, 2003M Inact, 44G Wired, 29G Free
ARC: 28G Total, 11G MFU, 16G MRU, 122M Anon, 359M Header, 1184M Other
      25G Compressed, 32G Uncompressed, 1.24:1 Ratio

Let me know what additional information I might supply.

This just means that WITNESS stopped working because it ran out of
pre-allocated objects.  In particular the objects used to track how
many locks are held by how many threads:

* XXX: This is somewhat bogus, as we assume here that at most 2048 threads
 * will hold LOCK_NCHILDREN locks.  We handle failure ok, and we should
 * probably be safe for the most part, but it's still a SWAG.
#define LOCK_CHILDCOUNT 2048

Probably the '2048' (max number of concurrent threads) needs to scale with
MAXCPU.  2048 threads is probably a bit low on big x86 boxes.

Thank you for you explanation. We are expanding our ESXi cluster and even though with standard edition I can only assign 64 vCPU's to a guest and as much RAM as I want, I do like to help with edge cases if I can make them occur pushing
boundaries as I can towards additianional improvements in FreeBSD.

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