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Displaying posts with tag: xtstat (reset)
xtstat: Tells you exactly what PBXT is doing!

I have created a new tool, called xtstat, for analyzing the performance of the PBXT storage engine.

The way it works is simple. PBXT now counts all kinds of things: transactions committed and rolled back, statements executed, records read and written, tables and indexes scanned, bytes read, written and flushed to various types of files: record, index, data logs, transaction logs, and so on.

A SELECT on the system table PBXT.STATISTICS (or INFORMATION_SCHEMA.PBXT_STATISTICS if PBXT was built inside the MySQL tree) returns the current totals of all these counters. xtstat does a SELECT every second on this table and prints the difference. In this way, you can see how much work PBXT is doing in each area.

There are currently 48 different statistics:

To ensure all this counting does not itself cost any performance, each thread counts for itself, so no locking is required. The SELECT on …

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