I hereby claim:
- I am alexandrnikitin on github.
- I am alexandrnikitin (https://keybase.io/alexandrnikitin) on keybase.
- I have a public key ASB7b7pQXfBHdylBlZ0IoI2k6GAVgQCHDLosAjZeMHkUNgo
To claim this, I am signing this object:
Alex Nikitin alexandrnikitin
alexandrnikitin
/ install-systemtap-on-centos-7.sh
Created
August 11, 2017 14:06
Install systemtap on Centos 7
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| sudo yum install -y systemtap systemtap-runtime | |
| sudo yum install kernel-debuginfo kernel-debuginfo-common | |
| sudo yum install yum-utils | |
| debuginfo-install kernel-3.10.0-514.21.2.el7.x86_64 | |
| sudo yum install -y kernel-devel-$(uname -r) | |
| sudo yum install -y kernel-debuginfo-$(uname -r) | |
| sudo yum install -y kernel-debuginfo-common-$(uname -m)-$(uname -r) |
alexandrnikitin
/ s3cmd-profile.log
Created
July 25, 2017 14:08
Profile results for https://github.com/s3tools/s3cmd/issues/902
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| 5549592 function calls (5549195 primitive calls) in 1101.296 seconds | |
| Ordered by: standard name | |
| ncalls tottime percall cumtime percall filename:lineno(function) | |
| 1 0.000 0.000 0.000 0.000 <string>:1(<module>) | |
| 1 0.000 0.000 0.000 0.000 <string>:1(DefaultVerifyPaths) | |
| 1 0.000 0.000 0.000 0.000 <string>:1(ParseResult) | |
| 1 0.000 0.000 0.000 0.000 <string>:1(SplitResult) | |
| 1 0.000 0.000 0.000 0.000 <string>:1(_ASN1Object) |
alexandrnikitin
/ s3cmd-slow.log
Last active
July 25, 2017 08:19
Logs for https://github.com/s3tools/s3cmd/issues/902
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| DEBUG: s3cmd version 2.0.0 | |
| DEBUG: ConfigParser: Reading file '/root/.s3cfg' | |
| DEBUG: ConfigParser: access_key->AK...17_chars...A | |
| DEBUG: ConfigParser: access_token-> | |
| DEBUG: ConfigParser: add_encoding_exts-> | |
| DEBUG: ConfigParser: add_headers-> | |
| DEBUG: ConfigParser: bucket_location->eu-west-1 | |
| DEBUG: ConfigParser: ca_certs_file-> | |
| DEBUG: ConfigParser: cache_file-> | |
| DEBUG: ConfigParser: check_ssl_certificate->True |
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| // install Eclipse Memory Analyzer (MAT) | |
| wget http://www.mirrorservice.org/sites/download.eclipse.org/eclipseMirror/mat/1.6.1/rcp/MemoryAnalyzer-1.6.1.20161125-linux.gtk.x86_64.zip | |
| unzip MemoryAnalyzer-1.6.1.20161125-linux.gtk.x86_64.zip | |
| cd mat/ | |
| // add more heap to mat | |
| nano MemoryAnalyzer.ini | |
| // create a dump | |
| su - username // if needed | |
| ps aux | grep java |
alexandrnikitin
/ full-strange-gc.log
Created
June 2, 2017 18:15
Strange behavior of G1 GC 1.8.0_131-b11 (G1 GC shrinks number of regions)
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| Java HotSpot(TM) 64-Bit Server VM (25.131-b11) for linux-amd64 JRE (1.8.0_131-b11), built on Mar 15 2017 01:23:40 by "java_re" with gcc 4.3.0 20080428 (Red Hat 4.3.0-8) | |
| Memory: 4k page, physical 263840860k(236794488k free), swap 4194300k(4194300k free) | |
| CommandLine flags: -XX:GCLogFileSize=10485760 -XX:InitialHeapSize=210453397504 -XX:MaxHeapSize=210453397504 -XX:MaxMetaspaceFreeRatio=90 -XX:MetaspaceSize=1073741824 -XX:NumberOfGCLogFiles=5 -XX:+ParallelRefProcEnabled -XX:+PrintAdaptiveSizePolicy -XX:+PrintGC -XX:+PrintGCApplicationStoppedTime -XX:+PrintGCDateStamps -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:+PrintReferenceGC -XX:+PrintTenuringDistribution -XX:+UseG1GC -XX:+UseGCLogFileRotation | |
| 0.629: [G1Ergonomics (Heap Sizing) expand the heap, requested expansion amount: 210453397504 bytes, attempted expansion amount: 210453397504 bytes] | |
| 2017-06-02T15:57:18.767+0200: 1.021: Total time for which application threads were stopped: 0.0002004 seconds, Stopping threads took: 0.0000396 seconds | |
| 2017-06-02T15:5 |
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| -Xms196G | |
| -Xmx196G | |
| -XX:+UseG1GC | |
| -XX:+ParallelRefProcEnabled | |
| -XX:MetaspaceSize=1024M | |
| -XX:MaxMetaspaceFreeRatio=90 | |
| -Xloggc:/var/log/service/gc.log | |
| -XX:+PrintGCDetails | |
| -XX:+PrintGCDateStamps | |
| -XX:+PrintReferenceGC |
alexandrnikitin
/ keybase.md
Created
May 22, 2017 08:10
alexandrnikitin
/ AhoCorasickTree.cs
Created
May 1, 2017 18:46
Aho-Corasick with some perf improvements
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| using System; | |
| using System.Collections.Generic; | |
| namespace Adform.AdServing.AhoCorasickTree.Sandbox.V7g | |
| { | |
| public class AhoCorasickTree | |
| { | |
| internal AhoCorasickTreeNode Root { get; set; } | |
| public AhoCorasickTree(IEnumerable<string> keywords) |
alexandrnikitin
/ TraversalUrolling.asm
Created
April 28, 2017 08:05
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| 0:006> !U /d 00007fff0d5e04d0 | |
| Normal JIT generated code | |
| Adform.AdServing.AhoCorasickTree.Benchmarks.ReadingString.TraversalUrolling() | |
| Begin 00007fff0d5e04d0, size 126 | |
| >>> 00007fff`0d5e04d0 4883ec28 sub rsp,28h | |
| 00007fff`0d5e04d4 33c0 xor eax,eax | |
| 00007fff`0d5e04d6 33d2 xor edx,edx | |
| 00007fff`0d5e04d8 48b978353a4fde010000 mov rcx,1DE4F3A3578h | |
| 00007fff`0d5e04e2 488b09 mov rcx,qword ptr [rcx] | |
| 00007fff`0d5e04e5 83790800 cmp dword ptr [rcx+8],0 |
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| using System.Collections.Generic; | |
| using System.Linq; | |
| namespace AhoCorasickTree | |
| { | |
| public class AhoCorasickTree | |
| { | |
| internal AhoCorasickTreeNode Root { get; set; } | |
| public AhoCorasickTree(IEnumerable<string> keywords) |