Share
Embed
Slide 1
Slide 1 text
@sartak
DTRACE
printf debugging for seventh-level wizards
࠷ڧͳຐ๏͍ͷprintfͷΑ͏ͳσόοΨ
1110݄15༵
Slide 2
Slide 2 text
ࣗݾհ
ɹShawn M Mooreɹ
ˏsartak
Mooseʹ͍͔͞͞ߩݙ͠Α͏ͱ͢Δ
ϘετϯʹॅΜͰ͍Δ
ձࣾ: Infinity Interactive
1110݄15༵
Slide 3
Slide 3 text
ॻ͍ͨϞʔδϡϧ
MooseX::Role::Parameterized
Any::Moose
cpandoc
Carp::REPL
Path::Dispatcher
App::Nopaste
(CPAN: SARTAK)
ଞʹɺΘͳ͍ͷํ͕͍͍ͬͯଟ͘ͷϞʔδϡϧ
1110݄15༵
Slide 4
Slide 4 text
DTRACE
1110݄15༵
Slide 5
Slide 5 text
ࠓɺίϯϐϡʔλ͕ԿΛͯ͠Δͷʁ
࣭:
͑: DTraceͰΔ͜ͱʹͳΕΔ
ਖ਼ͳ͑:
͍͍ͨͯɺχίχίͰಲೣΛ؍ͯΔ
1110݄15༵
Slide 6
Slide 6 text
iotop
͔ͯ͠͠ɺΒͣʹ͢ͰʹDTraceΛ͍ͬͯͨʂ
$ iotop
dtrace: failed to initialize dtrace:
DTrace requires additional privileges
1110݄15༵
Slide 7
Slide 7 text
OS X & Solaris(શ෦). Linux(͔͠Εͳ͍)
ϓϩϑΝΠϥʔ
(NYTProfΑΓਂ͘)
σόοΨʔ
ΧʔωϧϞʔδϡϧ
(DTraceΛOSʹϙʔτ͠ͳͯ͘ɺ
OSΛDTraceʹϙʔτ͢Δͬͯ)
DTRACE
1110݄15༵
Slide 8
Slide 8 text
XCodeͷϓϩϑΝΠϥDTraceΛ͏
1110݄15༵
Slide 9
Slide 9 text
dtruss
iotop
opensnoop
iosnoop
pidpersec
man -k dtrace
1110݄15༵
Slide 10
Slide 10 text
DTraceͱ৮
ɾΧʔωϧ (syscallؚΜͩ) ͷؔΛݺͼɺฦ͠
ɾPerlͷؔΛݺͼɺΓ
ɾSQL࣮ߦ
ɾthreads
ɾsignals
ɾଞͷΠϕϯτ͕ଟ͍
ϓϩʔϒ
1110݄15༵
Slide 11
Slide 11 text
ϓϩάϥϜՄೳ
dtrace -n '
syscall::open:entry
/strstr(copyinstr(arg0), "corpus") != NULL/ {
printf("%s %s",execname,copyinstr(arg0));
}'
ʮcorpusʯͱ͍͏ϑΝΠϧΛ։͘ϓϩηεΛදࣔ
͕͜ͷεΫϦϓτΛॻ͍ͯͬͨ
1110݄15༵
Slide 12
Slide 12 text
ϓϩάϥϜՄೳ
dtrace -n '
syscall::open:entry
/strstr(copyinstr(arg0), "corpus") != NULL/ {
printf("%s %s",execname,copyinstr(arg0));
}'
ʮcorpusʯͱ͍͏ϑΝΠϧΛ։͘ϓϩηεΛදࣔ
͕͜ͷεΫϦϓτΛॻ͍ͯͬͨ
Πϕϯτ(ϓϩʔϒͷهड़)
1110݄15༵
Slide 13
Slide 13 text
ϓϩάϥϜՄೳ
dtrace -n '
syscall::open:entry
/strstr(copyinstr(arg0), "corpus") != NULL/ {
printf("%s %s",execname,copyinstr(arg0));
}'
ʮcorpusʯͱ͍͏ϑΝΠϧΛ։͘ϓϩηεΛදࣔ
͕͜ͷεΫϦϓτΛॻ͍ͯͬͨ
ड़ޠ
1110݄15༵
Slide 14
Slide 14 text
ϓϩάϥϜՄೳ
dtrace -n '
syscall::open:entry
/strstr(copyinstr(arg0), "corpus") != NULL/ {
printf("%s %s",execname,copyinstr(arg0));
}'
ʮcorpusʯͱ͍͏ϑΝΠϧΛ։͘ϓϩηεΛදࣔ
͕͜ͷεΫϦϓτΛॻ͍ͯͬͨ
ΞΫγϣϯ
1110݄15༵
Slide 15
Slide 15 text
ϓϩάϥϜՄೳ
dtrace -n '
syscall::open:entry
/strstr(copyinstr(arg0), "corpus") != NULL/ {
printf("%s %s",execname,copyinstr(arg0));
}'
ʮcorpusʯͱ͍͏ϑΝΠϧΛ։͘ϓϩηεΛදࣔ
͕͜ͷεΫϦϓτΛॻ͍ͯͬͨ
1110݄15༵
Slide 16
Slide 16 text
σόοΨʔ
Request Tracker (rt.cpan.orgͱ͔)Ͱ
mod_perlͷςετΛࣦഊͯͨ͠ɻ
ͷίϯϐϡʔλ͚ͩͰɻ
ͨͿΜຊޠ͔ͩΒɻ
1110݄15༵
Slide 17
Slide 17 text
σόοΨʔ
Failed test
'gpg: error reading key: ެ։伴͕ݟ͔ͭΓ·ͤΜ'
doesn't match '(?-xism:public key not found)'
1110݄15༵
Slide 18
Slide 18 text
σόοΨʔ
RTຊޠ൛͕͋Δ͚Ͳɺ
ʮެ։伴͕ݟ͔ͭΓ·ͤΜʯͱ͍͏༁͕ɾɾɾͳ͔ͬͨʂʁ
1110݄15༵
Slide 19
Slide 19 text
σόοΨʔ
͋ʂͦͷจGPG͔Βདྷ͔ͨͳɾɾɾ
1110݄15༵
Slide 20
Slide 20 text
σόοΨʔ
gpg-2.0.18 $ ack -a ެ։伴͕ݟ͔ͭΓ·ͤΜ
gpg-2.0.18 $
1110݄15༵
Slide 21
Slide 21 text
σόοΨʔ
gpg-2.0.18 $ echo "ެ։伴͕ݟ͔ͭΓ·ͤΜ" |
iconv -f UTF-8 -t EUCJP | xargs ack -ao |
iconv -f EUCJP -t UTF-8
Binary file po/ja.gmo matches
po/ja.po:2965:ެ։伴͕ݟ͔ͭΓ·ͤΜ
po/ja.po:6525:ެ։伴͕ݟ͔ͭΓ·ͤΜ
po/ja.po:8311:ެ։伴͕ݟ͔ͭΓ·ͤΜ
gpg-2.0.18 $
1110݄15༵
Slide 22
Slide 22 text
σόοΨʔ
͜ͷࣦഊmod_perl͚͔ͩͩΒɺڥม͕ؒҧ͏ͩΖ͏
$LANGɺ$LC_ALL
1110݄15༵
Slide 23
Slide 23 text
σόοΨʔ
LC_ALL=en gpg
LC_ALL=ja gpg
LC_ALL= gpg
opensnoop
1110݄15༵
Slide 24
Slide 24 text
σόοΨʔ
DTraceΛΘͳ͍Ͱɺ
GPGͷࣗମʹprintΛଟ͘Ճ͢Δඞཁ
1110݄15༵
Slide 25
Slide 25 text
DTraceΛ͏ؾͳ͍ͥɻ
ͳͥͳΒɺࠓ͜ͷΞϓϦͷ͍ཧ༝Λௐ͍͕ͨɺ
͋ΒΏΔΞϓϦͷ͍ཧ༝Λݚڀ͢ΔઐՈʹੜ֔Λ͛ͨ͘͞͞ͳ͍Μͩɻ
(༁૬ͰͨΒΊͰ͢ɺΰϝϯͳʂ)
1110݄15༵
Slide 26
Slide 26 text
͑͑͑͑͑ʁ
ੑೳղੳ͕Լखʹଓ͚͍͔ͨʁ
͋ΒΏΔΞϓϦΛߴԽʹग़དྷͳ͍ʁ
ͦͷϘιϘιͰDTraceΛࢍͩͱࢥ͏
1110݄15༵
Slide 27
Slide 27 text
ҙʂ
DTraceͷݴޠɺʮifʯ͕ͳ͍ʂ
ΘΓʹɺड़ޠΛ͍·͠ΐ͏Ͷ
ß
1110݄15༵
Slide 28
Slide 28 text
ҙʂ
probe {
if (ok) {
x;
} else {
y;
}
}
probe /ok/ {
x;
}
probe /!ok/ {
y;
}
ͳͥͳΒɺDTrace͕ҋຐज़Λ͏ͩΖ͏
1110݄15༵
Slide 29
Slide 29 text
Perl
ɾ5.10.0Ҏ߱: sub-entry, sub-return
ɾ5.15.1Ҏ߱: phase-change (${^GLOBAL_PHASE})
ɹ
ɾকདྷʁ: string eval
perldoc perldtrace
1110݄15༵
Slide 30
Slide 30 text
Perl
ɾ5.10.0Ҏ߱: sub-entry, sub-return
ɾ5.15.1Ҏ߱: phase-change
ɹ
ɾকདྷʁ: string eval
ͷ࠷ॳPerlʹύονʂ
؆୯ͩͬͨʂ
perldtrace
1110݄15༵
Slide 31
Slide 31 text
͍ͤͪ͝ΐ͏
͋Γ͕ͱ͏
͍͟͝·ͨ͠
1110݄15༵
Slide 32
Slide 32 text
one more thing . . .
1110݄15༵
Slide 33
Slide 33 text
օͷݸਓͷεϙϯαʔ
ຊʹ
͋Γ͕ͱ͏͍͟͝·͢
1110݄15༵
Slide 34
Slide 34 text
࣭͋Γ·ͤΜ͔ʁ
ຊޠͰ̤̠Ͱ͢ʂ
slides: http://twitter.com/sartak
1110݄15༵