Uncompromised fairness
Athena stops resource monopolization by rogue sites. cgroups are the first layer of defense that impose firm limits on memory and PID counts while applying QoS to CPU and IO bandwidth. Secondary enforcement from DAPHNIE sets 24-hour usage limits on CPU and IO. A tertiary barrier sets reasonable PHP-FPM concurrency limits to stymie a sudden burst of inbound traffic before Evasive acts.
Each piece works in unison to ensure you have the highest possible reliability.
CPU/IO weighting
Set CPU and IO priority independently for each site or group of sites by leveraging plans.
I/O throttling
Set I/O performance boundaries in both bandwidth and IOPS. Athena throttles both dimensions.
PID counters
Athena includes process ID limits with a fallback thread ceiling to prevent monopolization with heavily threaded processes.
Memory limits
Set flexible memory limits for all processes spawned by a user.
Major services supported
Resource enforcement applies to HTTP, IMAP, POP3, FTP, CP, and SSH as well as subprocesses spawned by the account..
Faster performance, guaranteed
Servers running Athena operate faster with lower load averages.