Dear David,
mu12 is an "autonamed" mutex. The ability of naming (and profiling) of
mutexes is a feature of NaviServer (partly inherited from aolServer).
When no explicit names are provided to mutexes, these are autonamed and
show up like "mu12", which is actually the 12th mutex created on your
server.
The order and number of mutexes depend on the config file, so these
can't be compared easily cross configurations. However, mu12 is a rather
low number, so there is a certain hope that it will be the same on my
system. On my test sytems mu12 is used for serializing calls to
Tcl_CreateInterp() since this call is not thread-safe (maybe this has
changed in the newest tcl8.6 versions).
I am not too confident, that this mutex is the same as on your system,
since Tcl_CreateInterp() just creates an empty Tcl interpreter, which
should not take long and it should not happen so often. Please check
with the updated version from the repository, whether the name has
changed and we are actually talking about a contention of the same mutex.
all the best
-g
Am 07.07.16 um 11:43 schrieb David Osborne:
I was wondering if someone could help us understand this Mutex Lock
output from nsstats.
It's ordered by Contention and it would seem the figures for mu12, and
to a lesser extent, nsd:pool:<server>, are quite high.
I don't know what mu12 is used for. Could someone give an example of
the sort of workload which could result in such a high level of
contention for this mutex?
Inline images 1
Thanks in advance for any pointers.
--
David
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