I think there is unique separate behaviour for the Pty. The system terminates if the last data is written The system terminates if the child exits (broken pipe?) The code relies on the pipe existing long enough to send the data through, but the child exiting may cause the virtual channel to be deleted before … Read more
In my case, mysql config file had innodb_force_recovery = 1. Commenting that out solved the issue.
The experimental GCC version 4.7 disables Boost.Threads. See: https://svn.boost.org/trac/boost/ticket/6165 Edit: It should be noted that as of the release version of GCC 4.7, and Boost higher than 1.48 (Boost_1_48_0 is still not working), threads works again.
kill -QUIT process_id will cause a core dump from a running process (assuming that resource limits allow it). Or see man 3 abort for causing a program to dump itself. Added: From an interactive shell, a running program can be made to abort with the quit key, usually Ctrl+\, which sends a SIGQUIT just as … Read more
vmstat has default output which is similar in nature and takes many options that give extremely detailed information, eg vmstat -m swapinfo would cover the swap part top -d1 causes top to print one screen and exit, and the banner is very similar to free. Use top -d1 | head -n 7 to see only … Read more
If you have enough RAM it’s not too hard to handle 1M or more connections on linux. These guys handled 10 million connections with a java application on a single box using regular CentOS kernel with a few sysctl tweaks: sysctl -w fs.file-max=12000500 sysctl -w fs.nr_open=20000500 ulimit -n 20000000 sysctl -w net.ipv4.tcp_mem=’10000000 10000000 10000000′ sysctl … Read more
(answer updated to use -S as several commenters suggested) $ sysctl kern.maxfiles kern.maxfiles: 12288 $ sysctl kern.maxfilesperproc kern.maxfilesperproc: 10240 $ sudo sysctl -w kern.maxfiles=1048600 kern.maxfiles: 12288 -> 1048600 $ sudo sysctl -w kern.maxfilesperproc=1048576 kern.maxfilesperproc: 10240 -> 1048576 $ ulimit -S -n 256 $ ulimit -S -n 1048576 $ ulimit -S -n 1048576
This can’t be done using cut. According to the man page: Selected input is written in the same order that it is read, and is written exactly once. Patching cut has been proposed many times, but even complete patches have been rejected. Instead, you can do it using awk, like this: awk ‘{print($2,”\t”,$1)}’ abcd.txt Replace … Read more
os.environ is created on import of the os module, and doesn’t reflect changes to the environment that occur afterwards unless modified directly. Interestingly enough, however, os.getenv() doesn’t actually get the most recent environment variables either, at least not in CPython. You see, in CPython, os.getenv() is apparently just a wrapper around os.environ.get() (see http://hg.python.org/cpython/file/6671c5039e15/Lib/os.py#l646). So … Read more
This worked for me: – name: Create postgres database become: true become_user: postgres postgresql_db: name: <database-name> In your specific case the user might be pgsql, but I think usually the user is postgres.