Crucial Exams

CompTIA Linux+ XK0-006 (V8) Practice Question

The application team complains that response times occasionally spike on an 8-vCPU CentOS virtual machine that hosts a PostgreSQL database. You collect the following data during a slowdown:

$ uptime
 16:48:02 up 31 days,  7:01,  3 users,  load average: 62.19, 54.02, 31.74

$ top -bn1 | head -5
%Cpu(s):  5.4 us,  1.0 sy,  0.0 ni, 12.1 id, 81.5 wa,  0.0 hi,  0.0 si,  0.0 st

$ iostat -xz 1 3
Device:         r/s     w/s   rkB/s   wkB/s  await  svctm %util
vda            52.1   891.7  4241.2  36277.3 241.6   7.4 99.7

Based on these numbers, which situation is the most likely root cause of the high load average?

  • Numerous threads are stuck in uninterruptible disk I/O wait because the virtual disk is saturated.

  • A compute-bound workload is exhausting every CPU core, forcing other processes to wait for time slices.

  • Kernel memory over-commit is forcing heavy swapping, causing page-fault delays.

  • An interrupt storm on the 10-Gbps NIC is creating extreme context-switch overhead.

CompTIA Linux+ XK0-006 (V8)
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