Brendan Gregg

MAY 8, 2021

From these outputs I try to determine if the problem is: - **The workload**: High-latency disk I/O is commonly caused by the workload applied. Rotational disks have extra latency from head seeks for random I/O, and spin ups from the idle state. Note the sdb latencies range from 32 ms to over 2 seconds! Hit Ctrl-C to end.

Performance 133

Performance Latency Speed Systems 133

Percona

MARCH 20, 2023

MySQL router, after the 2048 connection, could not serve anything more. Let us take a look also the latency: Here the situation starts to be a little bit more complicated. Let us take a look also the latency: Here the situation starts to be a little bit more complicated. That allows it to go a bit further. and ProxySQL 6.6k.

Games 125

Games Latency Traffic Cache 125

Brendan Gregg

MAY 8, 2021

From these outputs I try to determine if the problem is: - **The workload**: High-latency disk I/O is commonly caused by the workload applied. Rotational disks have extra latency from head seeks for random I/O, and spin ups from the idle state. The latencies here look like they are a mix of normal speed (~1.9 Hit Ctrl-C to end.

Performance 40

Performance Latency Speed Systems 40

Brendan Gregg

MAY 8, 2021

From these outputs I try to determine if the problem is: - **The workload**: High-latency disk I/O is commonly caused by the workload applied. Rotational disks have extra latency from head seeks for random I/O, and spin ups from the idle state. Note the sdb latencies range from 32 ms to over 2 seconds! Hit Ctrl-C to end.

Performance 40

Performance Latency Speed Systems 40

Brendan Gregg

AUGUST 18, 2019

For example, iostat(1), or a monitoring agent, may tell you your average disk latency, but not the distribution of this latency. For smaller environments, it can be of more use helping eliminate latency outliers. Block I/O latency as a histogram. This traces block I/O, and shows latency as a power-of-2 histogram.

Latency 57

Latency C++ Cache Programming 57

SQL Server According to Bob

JANUARY 11, 2020

The caching of data pages and grouping of log records helps remove much, if not all, of the command latency associated with a write operation. Action Description Manual Checkpoint – Target Specified I/O latency target set to ​​ the default ​​ of ​​ 20ms.

Servers 40

Servers Cache Database Media 40