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Problem IT43562
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Status: Closed |
A THREAD CAN CONSUME 100% CPU UTILIZATION IN A SOCKET BACK FLOW SCENARIO LOOPING SEND() CALLS
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| product: |
INFORMIX SERVER / 5725A3900 / C10 - IDS 12.10 |
| Problem description: |
While the socket back flow situation may be illustrative of
another network related issue, the server should not consume
100% cpu retrying send() calls that continually fail with
EAGAIN/EWOULDBLOCK errors.
This is especially painful on a single cpu vp IDS server
An example of a CDR NIF send thread showing this behavior can be
seen by monitoring
output for a CDRNsT# thread which might show
something like:
249 CDRNsT6 1cpu 04/16 23:45:05
189.8525 342044266 running
249 CDRNsT6 1cpu 04/16 23:45:06
190.7593 342052426 running
249 CDRNsT6 1cpu 04/16 23:45:07
191.6844 342058701 running
where you would see the CDRNsT# thread constantly running or
ready and if you ran a pstack against the 1cpu vp oninit process
you would likely catch a stack like:
#0 0xffffe410 in __kernel_vsyscall ()
#1 0x008fc941 in send () from /lib/libpthread.so.0
#2 0x08f107f5 in sendsocket ()
#3 0x08f65ee4 in tlSend ()
#4 0x08f6267f in slSQIsend ()
#5 0x08efc946 in ASF_Call ()
#6 0x08b49ac3 in nifasf_putsendbuf ()
#7 0x08b49f91 in nifasf_send ()
#8 0x08b45d30 in nifiSendBuf ()
#9 0x08b4694b in nifSend ()
#10 0x08b3e46d in nifiGenericStart ()
#11 0x08a7bde4 in cdrTrampolineThread ()
#12 0x08dfc36c in th_init_initgls ()
#13 0x08e2e52b in startup ()
#14 0x00000000 in ?? () |
| Problem Summary: |
****************************************************************
* USERS AFFECTED: *
* Users of Informix Server prior to 12.10.xC16. *
****************************************************************
* PROBLEM DESCRIPTION: *
* See Error Description *
****************************************************************
* RECOMMENDATION: *
* Upgrade to Informix Server 12.10.xC16. *
**************************************************************** |
| Local Fix: |
|
| Solution |
|
| Workaround |
****************************************************************
* USERS AFFECTED: *
* Users of Informix Server prior to 12.10.xC16. *
****************************************************************
* PROBLEM DESCRIPTION: *
* See Error Description *
****************************************************************
* RECOMMENDATION: *
* Upgrade to Informix Server 12.10.xC16. *
**************************************************************** |
| Comment |
Fixed in Informix Server 12.10.xC16. |
| Timestamps |
Date - problem reported :
Date - problem closed :
Date - last modified :
| 17.04.2023
18.05.2023
18.05.2023 |
| Problem solved at the following versions (IBM BugInfos) |
|
| Problem solved according to the fixlist(s) of the following version(s) |
