[Wed Mar 15 13:43:09 2023] AuxIoPool1: page allocation failure: order:0, mode:0x1000000(GFP_NOWAIT), nodemask=(null)
[Wed Mar 15 13:43:09 2023] AuxIoPool1 cpuset=/ mems_allowed=0
[Wed Mar 15 13:43:09 2023] CPU: 6 PID: 2760 Comm: AuxIoPool1 Not tainted 4.14.305-227.531.amzn2.aarch64 #1
[Wed Mar 15 13:43:09 2023] Hardware name: Amazon EC2 c6gd.2xlarge/, BIOS 1.0 11/1/2018
[Wed Mar 15 13:43:09 2023] Call trace:
[Wed Mar 15 13:43:09 2023] dump_backtrace+0x0/0x190
[Wed Mar 15 13:43:09 2023] show_stack+0x24/0x30
[Wed Mar 15 13:43:09 2023] dump_stack+0x98/0xc8
[Wed Mar 15 13:43:09 2023] warn_alloc+0x11c/0x1b4
Dave Rigby daverigby
daverigby
/ timestamp_delta.py
Created
November 15, 2023 14:33
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| #!/usr/bin/env python3 | |
| """Reads from stdin / arguments a sequence of lines which contain an | |
| ISO 8601 timestamp, and outputs to stdout each line with the timestamp | |
| with the delta from the previous line. | |
| In other words, converts a file with absolute timstamps into a file | |
| with relative timestamps since the previous line. | |
| The first line cannot have a delta calculated, so it is reported as |
daverigby
/ lvmcache_page_allocation_failure.md
Last active
March 22, 2023 11:52
daverigby
/ Grafana Tips.md
Last active
June 27, 2023 17:05
- Expressions on different stats - doesn't work due to extra
namelabel which we need to discard:
sum without (name) (kv_ep_db_data_size_bytes{bucket="$bucket"}) / sum without (name) (kv_ep_db_file_size_bytes{bucket="$bucket"})
Note: Set chart type to 'Heatmap' (top right), Series format to 'Heatmap'
- Heatmap of KV opcode latencies:
sum by(le) (rate(kv_cmd_duration_seconds_bucket{opcode="ADD", bucket="$bucket"}[5m]))
daverigby
/ V8 macOS load commands difference 8.3 vs 10.7.21.md
Created
September 30, 2022 18:56
--- /Users/dave/Documents/MBs/MB-53924-v8_dyld/v8-8.3-cb5/libv8.dylib.load-commands 2022-09-30 19:52:49.000000000 +0100
+++ /Users/dave/Documents/MBs/MB-53924-v8_dyld/v8-10.7.21/libv8.dylib.load-commands 2022-09-30 19:53:03.000000000 +0100
@@ -1,23 +1,23 @@
-/Users/dave/Documents/MBs/MB-53924-v8_dyld/v8-8.3-cb5/libv8.dylib:
+/Users/dave/Documents/MBs/MB-53924-v8_dyld/v8-10.7.21/libv8.dylib:
Load command 0
cmd LC_SEGMENT_64
- cmdsize 632
+ cmdsize 712
daverigby
/ ns_server REST commands.md
Last active
December 9, 2021 16:07
Useful ns_server REST commands
- Change num_writer_threads from command-line
curl --user Administrator:asdasd -X POST --data "num_writer_threads=disk_io_optimized" http://localhost:9000/pools/default/settings/memcached/global
(Can also use num_reader_threads, and specify an exact number)
- Change number of shards from command-line:
curl -i -u Administrator:asdasd --data 'ns_bucket:update_bucket_props("default", [{extra_config_string, "max_num_shards=64"}]).' http://localhost:9000/diag/eval
daverigby
/ local_manifest.xml
Last active
June 15, 2021 14:56
Repo manifest: override using local manifest
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| <?xml version="1.0" encoding="UTF-8"?> | |
| <manifest> | |
| <remote name="gerrit" fetch="ssh://review.couchbase.org:29418/" /> | |
| <remove-project name="build" /> | |
| <project path="cbbuild" name="build" remote="gerrit" revision="refs/changes/28/155828/1" groups="notdefault,build" /> | |
| </manifest> |
daverigby
/ path_queue_depth.cc
Created
April 30, 2021 11:37
Determine the maximum number of requests (OS-level queue depth) for the given file path
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| #include <sys/sysmacros.h> | |
| #include <sys/types.h> | |
| #include <sys/stat.h> | |
| #include <fcntl.h> | |
| #include <unistd.h> | |
| #include <iostream> | |
| #include <string> | |
| int main(int argc, char** argv) { | |
| if (argc != 2) { |
daverigby
/ KV-Engine Bug Triage.md
Created
January 4, 2021 13:22
Triage, noun: the process of determining the most important people or things from amongst a large number that require attention.
The aim of Bug Triage is to perfom an initial analysis of all new bugs, to determine is (a) they are a valid KV-Engine bug and (b) how important it is to fix.
After Triage a bug should either:
- Be accepted as a valid KV-Engine bug, and have a suitable Priority and position in the Backlog, or
- Be rejected as not a valid KV-Engine bug, and:
- Assigned to the appropriate other team to investigate, or
daverigby
/ getChunkTenant (CentOS 8)
Created
November 16, 2020 11:14
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| (gdb) disas | |
| Dump of assembler code for function _ZN8phosphor8TraceLog14getChunkTenantEv: | |
| => 0x00007ff6391ec420 <+0>: push %r12 | |
| 0x00007ff6391ec422 <+2>: push %rbp | |
| 0x00007ff6391ec423 <+3>: mov %rsi,%r12 | |
| 0x00007ff6391ec426 <+6>: push %rbx | |
| 0x00007ff6391ec427 <+7>: mov %rdi,%rbx | |
| 0x00007ff6391ec42a <+10>: sub $0x10,%rsp | |
| 0x00007ff6391ec42e <+14>: data16 lea 0x208aca(%rip),%rdi # 0x7ff6393f4f00 | |
| 0x00007ff6391ec436 <+22>: data16 data16 callq 0x7ff6391de2e0 <__tls_get_addr@plt> |
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