The error message: Can't create a new thread (errno 35); if you are not
out of available memory, you can consult the manual for a possible
Our website started getting this error several weeks ago (when we
increased the number of application server machines connecting to the
database from 5 to 7. It seems to happen anywhere from every 2 days to
once a week, there does not seem to be a consistent pattern. Our CPU
utilization, memory utilization, and number of HTTP Requests seem to be
at "normal" (they are no where closed to being maxed out). When this
error happens we CAN log onto the server with the MySQL database, but I
CAN NOT use the mysql client to connect to the mysql database (localhost
connection as root) - it reports the error mentioned above. The way we
temporarily solve the problem is to restart one of our web servers.
Here is our technology stack:
Web Servers: 7, Each server has:
4 Gb of Memory on each server
2.4 GHz CPU
Webware for Python
DB Servers: One Master, Two Read Only (replication)
4 GB of Memory on each server
FreeBSD 6.3-RELEASE-p3 FreeBSD 6.3-RELEASE-p3
We have tried bumping up our number of max allowed connections (up to
1000) on MySQL and kern.ssize to 512Mb for FreeBSD. That did not help.
The max connections usually hovers ~300, so it does not even get close
to the 1000 we have set. Finally the last place that we have looked is
the openfiles, it is set at 20,000 for the whole system, with 14K per
process on the FreeBSD operating system.
Here are some relevent items from my.cnf:
- set-variable = max_connections=1000
- set-variable = key_buffer_size=384M
- set-variable = read_buffer_size=64M
- set-variable = read_rnd_buffer_size=32M
- set-variable = thread_cache_size=20
Any help would be much appreciated.
- Sam Nilsson
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