Exam XK0-005 topic 1 question 114 discussion

Based on the output provided, the issue causing the slowness is B. The CPU is overloaded. The load average of 9.90 indicates that there are, on average, 9.90 processes in the running or runnable state. Given that there is only a single CPU, this means that there are far more processes needing CPU time than the CPU can handle, leading to an overloaded CPU. This is likely the cause of the slowness. The other options (A, C, and D) do not seem to be supported by the provided output. The output does not indicate that the system is running out of swap space (almost all free), that the memory is exhausted (still have a lot of free mem), or that the processes are paging (only 5 for pages used). Therefore, these are not likely to be the cause of the slowness.

processes are paging so (swap out) values 26211 and 5242 indicate active paging

D. The PROCESSES are PAGING. The significant ( >1000 KB/s) si (swap in from disk ) and so (swap out to disk) values indicate that the system is actively PAGING data between RAM and swap space, which significantly slows down performance due to the slow nature of disk I/O compared to RAM access. High values (>0 consistently) in the b column (blocked [aka waiting] PROCESSES) also support the indication of I/O bottlenecks related to PAGING. Heavy PAGING indicates that PROCESSES are waiting for data to be read from or written to swap space, which causes the observed I/O bottleneck and system slowness. The system's high load averages and blocked PROCESSES further confirm this. (caps for impact)

While the load average is high, it doesn't directly imply that the CPU is overloaded. Instead, the "si" and "so" values in the vmstat output indicate that processes are paging in and out of swap, which typically points to I/O bottlenecks and disk activity as the primary cause of slowness. So, based on the provided information, the most likely cause of slowness is related to I/O and processes paging, rather than CPU overload. Therefore, option B (The CPU is overloaded) is less likely to be the primary cause.

B or D ? please help As you can see we have bo values -> blocks sent to a block device. paged memory , and so value -> Amount of memory swapped to disk (/s). and id -> idle elapsed time. = 0 ( normal value is 99 and 100 )

The %id displays CPU idle time and if this is too high then this indicates that the CPU is working too hard

im not seeing and swap or memory issues, what we do see is the CPU ID value at 99, so i pick B.