Matt Ranney mranney
mranney
/ gist:7834019
Created
December 6, 2013 23:38
Using DTrace to catch a really tricky bug in production
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| dtrace -n 'syscall::writev:entry /execname == "node" && arg2 > 3/ { printf("iovcnt: %d", arg2); }' -n 'syscall::writev:return /execname == "node" && arg1 == -1 && errno == 22/ { printf("%s %s %d\\n", curpsinfo->pr_psargs, probefunc, errno); jstack(100, 8000); }' | |
| dtrace: description 'syscall::writev:entry ' matched 1 probe | |
| dtrace: description 'syscall::writev:return ' matched 1 probe | |
| 1 10260 writev:entry iovcnt: 57 | |
| 1 10261 writev:return node --nouse-idle-notification /voxer/server/node_router/node_router.js /voxer/ writev 22\n | |
| libc.so.1`__writev+0x15 | |
| node`uv__write.part.5+0x18f | |
| node`uv_write2+0x1b9 | |
| node`uv_write+0x35 | |
| node`_ZN4node10StreamWrap6WritevERKN2v89ArgumentsE+0x678 |
mranney
/ thomas_pong.js
Created
December 6, 2013 04:45
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| background(117,177,220); | |
| stroke(31,134,46); | |
| fill(31,134,46); | |
| rect(450, 5, 10, 100); | |
| rect(50, 200, 10, 100); | |
| fill(56,42,237); |
mranney
/ gist:6006259
Created
July 16, 2013 06:27
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| > var b = []; for (var i = 0; i < 1024 * 1024 ; i++) { b.push(new Buffer(1024)); } | |
| 1048576 | |
| > process.memoryUsage() | |
| { rss: 141910016, | |
| heapTotal: 104296088, | |
| heapUsed: 101654176 } | |
| > var b = []; for (var i = 0; i < 1024 * 1024 ; i++) { b.push(new Buffer(2048)); } | |
| 1048576 | |
| > process.memoryUsage() | |
| { rss: 778919936, |
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| mjr@prod-2119:~ [zookeeper]$ gdb /opt/local/bin/node ./core.82428 | |
| GNU gdb (GDB) 7.3.1 | |
| Copyright (C) 2011 Free Software Foundation, Inc. | |
| License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> | |
| This is free software: you are free to change and redistribute it. | |
| There is NO WARRANTY, to the extent permitted by law. Type "show copying" | |
| and "show warranty" for details. | |
| This GDB was configured as "x86_64-sun-solaris2". | |
| For bug reporting instructions, please see: | |
| <http://www.gnu.org/software/gdb/bugs/>... |
mranney
/ gist:5551257
Created
May 9, 2013 23:04
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| > ::fpregs | |
| _fp_hw 0x03 (80387 chip with SSE) | |
| cw 0x0c7f (IM|DM|ZM|OM|UM|PM|RC|RTZ|P) | |
| sw 0x0c77 (TOP=0t1) (IE|DE|ZE|UE|PE|SF|C2) | |
| xcp sw 0x0000 (0) | |
| ipoff port_poll+0x49 | |
| cssel 0x0 | |
| dtoff 0x8047bd8 | |
| dtsel 0x0 |
mranney
/ gist:5551220
Created
May 9, 2013 22:55
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| > *0x87ebddc | |
| libm.so.2`floor: subl $0x8,%esp | |
| libm.so.2`floor+3: fwait | |
| libm.so.2`floor+4: fnstcw (%esp) | |
| libm.so.2`floor+7: fldl 0xc(%esp) | |
| libm.so.2`floor+0xb: movw (%esp),%cx | |
| libm.so.2`floor+0xf: orw $0xc00,%cx | |
| libm.so.2`floor+0x14: xorw $0x800,%cx | |
| libm.so.2`floor+0x19: movw %cx,0x4(%esp) | |
| libm.so.2`floor+0x1e: fldcw 0x4(%esp) |
mranney
/ gist:5551201
Created
May 9, 2013 22:51
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| > libm.so.2`floor::dis | |
| libm.so.2`floor: subl $0x8,%esp | |
| libm.so.2`floor+3: fwait | |
| libm.so.2`floor+4: fnstcw (%esp) | |
| libm.so.2`floor+7: fldl 0xc(%esp) | |
| libm.so.2`floor+0xb: movw (%esp),%cx | |
| libm.so.2`floor+0xf: orw $0xc00,%cx | |
| libm.so.2`floor+0x14: xorw $0x800,%cx | |
| libm.so.2`floor+0x19: movw %cx,0x4(%esp) | |
| libm.so.2`floor+0x1e: fldcw 0x4(%esp) |
mranney
/ gist:5551188
Created
May 9, 2013 22:49
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| > _ZN2v88internal23Runtime_DateCurrentTimeENS0_9ArgumentsEPNS0_7IsolateE-0x3219db::dis | |
| PLT:sin: *ERROR--unknown op code** | |
| PLT:pow: jmp *0x87ebdd8 | |
| PLT:pow: pushl $0x7d0 | |
| PLT:pow: jmp -0xfc0 <0x81de188> | |
| PLT=libm.so.2`floor: jmp *0x87ebddc | |
| PLT=libm.so.2`floor: pushl $0x7d8 | |
| PLT=libm.so.2`floor: jmp -0xfd0 <0x81de188> | |
| PLT:fmod: jmp *0x87ebde0 | |
| PLT:fmod: pushl $0x7e0 |
mranney
/ gist:5549123
Created
May 9, 2013 17:38
Date.now() gets stuck after a while and then only updates slowly.
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| djg@prod-2122:~$ sudo rc /tmp/repl/prod-metricsserver4.sock | |
| prod-metricsserver4> Date.now() | |
| 1368115118080 | |
| prod-metricsserver4> Date.now() | |
| 1368115118080 | |
| prod-metricsserver4> Date.now() | |
| 1368115118080 | |
| .... much time passes ... |
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| make[1]: Entering directory `/voxer/deploy/node/out' | |
| cc '-D_LARGEFILE_SOURCE' '-D_FILE_OFFSET_BITS=64' '-DL_ENDIAN' '-DOPENSSL_THREADS' '-DPURIFY' '-D_REENTRANT' '-DOPENSSL_NO_DTLS1' '-DOPENSSL_NO_SOCK' '-DOPENSSL_NO_DGRAM' '-DOPENSSL_NO_GOST' '-DOPENSSL_NO_HW_PADLOCK' '-DOPENSSL_NO_TTY' '-DAES_ASM' '-DBF_ASM' '-DBNCO_ASM' '-DBN_ASM' '-DCPUID_ASM' '-DDES_ASM' '-DLIB_BN_ASM' '-DOPENSSL_BN_ASM' '-DOPENSSL_CPUID_OBJ' '-DRIP_ASM' '-DWHIRLPOOL_ASM' '-DWP_ASM' '-DENGINESDIR="/dev/null"' '-DOPENSSLDIR="/etc/ssl"' '-DTERMIOS' '-D__EXTENSIONS__' -I../deps/openssl -I../deps/openssl/openssl -I../deps/openssl/openssl/crypto -I../deps/openssl/openssl/crypto/asn1 -I../deps/openssl/openssl/crypto/evp -I../deps/openssl/openssl/crypto/store -I../deps/openssl/openssl/include -I../deps/openssl/config/k8 -Wall -m64 -pthreads -O2 -fno-strict-aliasing -ffunction-sections -fdata-sections -fno-tree-vrp -fno-omit-frame-pointer -MMD -MF /voxer/deploy/node/out/Release/.deps//voxer/deploy/node/out/Release/obj.target/openssl/deps/ope |