piperd in top

DAve dave.list at pixelhammer.com
Fri Aug 4 16:55:51 UTC 2006

Alex Zbyslaw wrote:
> Dan Nelson wrote:
>> In the last episode (Aug 02), DAve said:
>>> Dan Nelson wrote:
>>>> In the last episode (Aug 01), DAve said:
>>>>> We are in the process of getting a good hammering of spam. I've
>>>>> been watching my mail gateways and they are keeping up well enough.
>>>>> But looking at top I am seeing a lot of processes with state of
>>>>> piperd.
>>>> Piperd means the process is waiting on a read from a pipe.  You can
>>>> use lsof to determine what process is at the other end of the pipe
>>>> (run lsof, find your process, find the PIPE fd, then find the other
>>>> process with the same 0xXXXXXXXX value).
>>> Excellent, thank you. May I ask where you found that info. I looked
>>> but came up empty. I'd like to know the meanings of some other states
>>> not mentioned in the man pages. Such as nanslp, *GIANT, kqread, etc.
>> The only place wait states are documented is the source, basically. 
>> There are many hundreds of them.  States with an asterisk are mutexes
>> To find the code related to piperd:
>> find /usr/src/sys -name "*.c" | xargs grep -n piperd
> Or you could search the archive of questions@ where many of the more 
> common states where elucidated just a couple months ago and Giorgos 
> provided a good description of the UPPER CASE states.
> --Alex

Thank you, the response from Eric Schuele was what I was looking for.



Three years now I've asked Google why they don't have a
logo change for Memorial Day. Why do they choose to do logos
for other non-international holidays, but nothing for

Maybe they forgot who made that choice possible.

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