Various search databases and backends as alternatives to Elasticsearch.
| # Pre-req: gcc, gcc-c++, git (to clone), openjdk with debug symbols (centos: java-1.8.0-openjdk-debug.x86_64, ubuntu: openjdk-8-dbg) | |
| # Git clone async-profiler https://github.com/jvm-profiling-tools/async-profiler | |
| # Make sure JAVA_HOME is set and you are logged as same user running the java process | |
| cd async-profiler | |
| make all | |
| # Also git clone FlameGraph in the same directory as you clone async-profiler | |
| # sysctl changes | |
| echo 1 > /proc/sys/kernel/perf_event_paranoid | |
| echo 0 > /proc/sys/kernel/kptr_restrict |
| import metric_pb2 | |
| from google.protobuf.internal.encoder import _VarintBytes | |
| from google.protobuf.internal.decoder import _DecodeVarint32 | |
| import timeit | |
| import random | |
| from functools import partial | |
| import io | |
| N_RUNS = 10 |
| # Base settings and GC logging | |
| -server -XX:+AlwaysPreTouch # First should be default, but we make it explicit, second pre-zeroes memory mapped pages on JVM startup -- improves runtime performance | |
| # -Xloggc:gc-%t.log # CUSTOMIZE LOCATION HERE - $path/gc-%t.log -- the %t in the gc log file path is so we get a new file with each JVM restart | |
| -XX:NumberOfGCLogFiles=5 -XX:+UseGCLogFileRotation -XX:GCLogFileSize=20m # Limits the number of files, logs to folder | |
| -XX:+PrintGC -XX:+PrintGCDateStamps -XX:+PrintGCDetails -XX:+PrintHeapAtGC -XX:+PrintGCCause | |
| -XX:+PrintTenuringDistribution -XX:+PrintReferenceGC -XX:+PrintAdaptiveSizePolicy # gather info on object age & reference GC time for further tuning if needed. | |
| # G1 specific settings -- probably should be default for multi-core systems with >2 GB of heap (below that, default is probably fine) | |
| -XX:+UseG1GC | |
| -XX:+UseStringDeduplication |
Jon Warbrick, July 2014, V3.2 (for Ansible 1.7)
First one found from of
All of the below properties or methods, when requested/called in JavaScript, will trigger the browser to synchronously calculate the style and layout*. This is also called reflow or layout thrashing, and is common performance bottleneck.
Generally, all APIs that synchronously provide layout metrics will trigger forced reflow / layout. Read on for additional cases and details.
elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent
Hello, visitors! If you want an updated version of this styleguide in repo form with tons of real-life examples… check out Trellisheets! https://github.com/trello/trellisheets
“I perfectly understand our CSS. I never have any issues with cascading rules. I never have to use !important or inline styles. Even though somebody else wrote this bit of CSS, I know exactly how it works and how to extend it. Fixes are easy! I have a hard time breaking our CSS. I know exactly where to put new CSS. We use all of our CSS and it’s pretty small overall. When I delete a template, I know the exact corresponding CSS file and I can delete it all at once. Nothing gets left behind.”
You often hear updog saying stuff like this. Who’s updog? Not much, who is up with you?
| git branch -m old_branch new_branch # Rename branch locally | |
| git push origin :old_branch # Delete the old branch | |
| git push --set-upstream origin new_branch # Push the new branch, set local branch to track the new remote |
| [xml]$config = (& "$env:WINDIR\system32\inetsrv\appcmd.exe" list config /section:httpCompression) | |
| if ($config -ne $null -and ($config.GetElementsByTagName("httpCompression") -ne $null)) { | |
| $compression = $config.GetElementsByTagName("httpCompression")[0] | |
| $dynamic = $compression.dynamicTypes | |
| EnableCompression $dynamic "dynamicTypes" "application/x-javascript" | |
| EnableCompression $dynamic "dynamicTypes" "application/atom+xml" | |
| } |
| function sum (fn, xs) { | |
| var toRet = 0; | |
| for (var i = 0, ii = xs.length; i < ii; i++) { | |
| toRet += fn(xs[i], i, xs); | |
| } | |
| return toRet; | |
| } | |
| function update(t, o) { | |
| for (var k in o) { |