Varnish child killed

[Thiago Figueiro]

From: Jean-Francois Laurens

> Hi there,

> Apr 20 21:48:43 server-01-39 varnishd[21087]: Child (5372) not responding 
> to CLI, killing it.

Hi!  I'm a bit late to the discussion (happy Easter everyone!) but we came across this issue on Linux earlier this year.

You didn't send charts for your disk IO but I'm betting it looks busy.  If this is so, it may be the kernel pre-empting writing of dirty mmap pages to disk.

I investigated the issue at the time and found that on the RHEL 5 vanilla kernel the Varnish child was being blocked by kernel IO. This caused the parent pings to time-out:

http://microrants.blogspot.com/2010/07/varnish-and-linux-io-bottleneck.html


TL;DR: 
echo 0 > /proc/sys/vm/flush_mmap_pages


  
Good luck,
Thiago.


______________________________________________________
    CONFIDENTIALITY NOTICE    
This electronic mail message, including any and/or all attachments, is for the sole use of the intended recipient(s), and may contain confidential and/or privileged information, pertaining to business conducted under the direction and supervision of the sending organization. All electronic mail messages, which may have been established as expressed views and/or opinions (stated either within the electronic mail message or any of its attachments), are left to the sole responsibility of that of the sender, and are not necessarily attributed to the sending organization. Unauthorized interception, review, use, disclosure or distribution of any such information contained within this electronic mail message and/or its attachment(s), is (are) strictly prohibited. If you are not the intended recipient, please contact the sender by replying to this electronic mail message, along with the destruction all copies of the original electronic mail message (along with any attachments).
______________________________________________________