Brendan Gregg

MAY 8, 2021

It may be due to queueing, especially from file systems that send a batch of writes. 66-generic (lgud-bgregg) 12/16/2020 _x86_64_ (8 CPU) avg-cpu: %user %nice %system %iowait %steal %idle 7.70 avg-cpu: %user %nice %system %iowait %steal %idle 7.90 avg-cpu: %user %nice %system %iowait %steal %idle 7.70 Hit Ctrl-C to end.

Performance 133

Performance Latency Speed Systems 133

Percona

AUGUST 21, 2023

Even though there is an encrypted session between psql and the Postgres server, there is no encrypted session between Postgres and LDAP as authentication is performed: SSL connection (protocol: TLSv1.3,

C++ 98

C++ Servers Open Source Testing 98

Percona

AUGUST 29, 2023

Step three: Check packages Inspecting the nodes confirms Citus has been correctly installed: for u in citus1 citus2 citus3 citus4 citus-coord-01 do echo " = NODE: $u =" lxc exec $u -- su - postgres -c 'psql db01'<<_eof_ select extname, extversion from pg_extension; _eof_ done | less -S = NODE: citus1 = extname | extversion -+ plpgsql | 1.0

C++ 98

C++ Database Storage Testing 98

Percona

OCTOBER 2, 2023

Percona Toolkit is a collection of advanced open source command-line tools, developed and used by the Percona technical staff, that are engineered to perform a variety of MySQL, MariaDB, MongoDB, and PostgreSQL server and system tasks that are too difficult or complex to perform manually. pt-summary --user=root [?2004l# virtual = 2.2G

Cache 114

Cache Database Virtualization Servers 114

Brendan Gregg

AUGUST 18, 2019

C @ns: [256, 512) 10900 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ | [512, 1k) 18291 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@| [1k, 2k) 4998 |@@@@@@@@@@@@@@ | [2k, 4k) 57 | | [4k, 8k) 117 | | [8k, 16k) 48 | | [16k, 32k) 109 | | [32k, 64k) 3 | |. system(".") Hit Ctrl-C to end. ^C Attaching 2 probes. ^C pid process ID.

Latency 57

Latency C++ Cache Programming 57

Brendan Gregg

MAY 8, 2021

It may be due to queueing, especially from file systems that send a batch of writes. 66-generic (lgud-bgregg) 12/16/2020 _x86_64_ (8 CPU) avg-cpu: %user %nice %system %iowait %steal %idle 7.70 avg-cpu: %user %nice %system %iowait %steal %idle 7.90 avg-cpu: %user %nice %system %iowait %steal %idle 7.70 Hit Ctrl-C to end.

Performance 40

Performance Latency Speed Systems 40

Brendan Gregg

MAY 8, 2021

It may be due to queueing, especially from file systems that send a batch of writes. 66-generic (lgud-bgregg) 12/16/2020 _x86_64_ (8 CPU) avg-cpu: %user %nice %system %iowait %steal %idle 7.70 avg-cpu: %user %nice %system %iowait %steal %idle 7.90 avg-cpu: %user %nice %system %iowait %steal %idle 7.70 Hit Ctrl-C to end.

Performance 40

Performance Latency Speed Systems 40