Java High-Performance Architecture

Nov 17, 2015 · Operations

Why Is My Server Overloaded? Diagnosing Nginx FastCGI Temp IO Bottleneck

A sudden high‑load alert on a web server was traced to Nginx’s massive write operations on fastcgi_temp files, revealed through top, iotop, lsof, strace and iostat, and temporarily resolved by redirecting fastcgi_temp to memory.