Sarajevo, Bosnia and Herzegovina

Monitor live MySQL queries

Log to your mysql with mysql -u username -pPassword and execute: mysql> SHOW VARIABLES LIKE “general_log%”; +——————+—————————-+ | Variable_name | Value | +——————+—————————-+ | general_log | OFF | | general_log_file | /var/run/mysqld/mysqld.log | +——————+—————————-+ mysql> SET GLOBAL general_log = ‘ON’; Then in another terminal execute tail -f -n300 /var/run/mysqld/mysqld.log Then don’t forget to disable general_log […]

Categories: Web
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Clearing Linux disk cache

For experimentation, it’s very convenient to be able to drop the disk cache. For this, we can use the special file /proc/sys/vm/drop_caches. By writing 3 to it, we can clear most of the disk cache: $ free -m total used free shared buffers cached Mem: 1504 1471 33 0 36 801 -/+ buffers/cache: 633 871 […]

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Socket::SetIpTos in NS-3 ver.3.26

One of the changes between ns-3 ver 3.25 and ver 3.26 is that now it is possible to set TOS value to the address. Yes, you read it right, TOS value to the address. Official Doxygen states following: https://www.nsnam.org/docs/release/3.26/models/html/sockets-api.html The native sockets API for ns-3 provides two public methods (of the Socket base class): void […]

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