Bug 48220

Bug: 48220

Impact:

Product:

GemStone/S 64 Bit

Versions:

3.7.1, 3.7, 3.6.8, 3.6.7, 3.6.6, 3.6.5, 3.6.4, 3.6.3, 3.6.2, 3.6.1, 3.6, 3.5.8, 3.5.7, 3.5.6, 3.5.5, 3.5.4, 3.5.3, 3.5.2, 3.5.1, 3.5, 3.4.5, 3.4.4, 3.4.3, 3.4.2, 3.4.1, 3.4, 3.3.9, 3.3.8, 3.3.7, 3.3.6, 3.3.5, 3.3.4, 3.3.3, 3.3.2, 3.3.1, 3.3, 3.2.16, 3.2.15, 3.2.14, 3.2.13, 2.4.8, 2.4.4.8, 2.4.4.7, 2.4.x

Platform:

Fixed In:

3.5.1, 3.4.4

Invalid results from System>>hostCpuUsage

The method System>>hostCpuUsage returns an Array of integers describing the percent active, idle, user, system, and I/O wait.

In versions earlier than v3.4.4/v3.5.1, the return values on some platforms may have been entirely 0, or a set of values that did not add up to 100.  This was due to incorrect rounding in the calculations.

Note that the first call to this within a gem, and back-to-back calls, provide invalid results (entirely idle CPU) on some platforms. On Linux, hostCpuUsage is based on reading files in /proc. For calls that are too close together, the kernel will not have updated the statistics information; you will need to wait 10ms-100ms between calls to get valid CPU usage numbers.