Used to identify memory exhaustion during database lock-ups.
When a tool like pt-stalk or pt-sift captures this value, it isn't just a random number; it's a diagnostic snapshot used to identify "blockers" or resource contention.
: Often, servers appear healthy because CPU usage is low, but metrics like "free memory" and "wait time" (the wa column in logs) tell the real story of a system struggling to keep up with I/O. Summary of Technical Attributes Data Source vmstat / pt-sift Standard Linux performance reporting tools. Unit Kilobytes (KB) Represents ~119.2 MiB of memory. Primary Use Troubleshooting 122064
: In the specific trace where this number appears, it is analyzed alongside diskstats (disk I/O) and innodb transaction logs to see if memory pressure is causing threads to wait. Broader Context: Why Numbers Like This Matter
: Seeing 122,064 KB free on a high-performance database server can be a warning sign. While Linux prefers to use "free" RAM for caching, a sudden drop toward this level often precedes swap activity , which can drastically slow down database queries. Used to identify memory exhaustion during database lock-ups
To provide a "deep" look, this post explores the technical context of this value within system monitoring, specifically as it relates to database performance and server health. The Significance of 122064 in System Monitoring
For system administrators and developers, "122064" represents the importance of . Summary of Technical Attributes Data Source vmstat /
: A "deep" analysis of system logs requires comparing this "free" value against a baseline. If the server normally has 8 GB free and suddenly hits 122 MB, you are looking at a memory leak or a massive query spike.