DTrace and Ruby

It’s been an exciting few weeks for
DTrace.
The party got started with
Wez Furlong’s new
PHP
DTrace provider
at OSCON. Then
Devon O’Dell
announced that he was starting to work in earnest on a
DTrace
port to FreeBSD
. And now,
Rich Lowe
has made available a prototype
Ruby
DTrace provider
.
To install this, grab
Ruby 1.8.2,
apply
Rich’s
patch
, and run ./configure with
the --enable-dtrace option.
When you run the resulting ruby, you’ll see two probes:
function-entry and
function-return.
The arguments to these probes are as follows:

So if, for example, you’d like to know the classes and methods that
are called in a particular Ruby script, you could do it with this
simple D script:

#pragma D option quiet
ruby$target:::function-entry
{
@[copyinstr(arg0), copyinstr(arg1)] = count();
}
END
{
printf("%15s %30s   %s\n", "CLASS", "METHOD", "COUNT");
printa("%15s %30s   %@d\n", @);
}

To run this against the cal.rb that ships in the sample
directory of Ruby, call the above script whatmethods.d and
run it this way:

# dtrace -s ./whatmethods.d -c "../ruby ./cal.rb"
August 2005
S  M Tu  W Th  F  S
1  2  3  4  5  6
7  8  9 10 11 12 13
14 15 16 17 18 19 20
21 22 23 24 25 26 27
28 29 30 31
CLASS                         METHOD   COUNT
Array                             <=   2
Hash                           each   2
Hash                           keys   2
Module                           attr   2
Module               method_undefined   2
Module                         public   2
Rational                         coerce   2
Array                              +   3
Class                    civil_to_jd   3
Hash                             []   3
Object                        collect   3
Array                        collect   4
Class                      inherited   4
Range                           each   4
String                           size   4
Module           private_class_method   5
Object                           eval   5
Object                        require   5
String                           gsub   5
Class                     jd_to_wday   7
Class                           once   7
Date                       __8713__   7
Date                           wday   7
Fixnum                              %   8
Array                           join   10
Hash                            []=   10
String                              +   10
Array                           each   11
NilClass                           to_s   11
Module                   alias_method   22
Module                        private   22
Symbol                           to_s   26
Module                    module_eval   28
Date                           mday   31
Object                           send   31
Date                            mon   42
Date                      __11105__   43
Class                    jd_to_civil   45
Date                           succ   47
Class                            os?   48
Date                              +   49
Fixnum                             <=   49
String                          rjust   49
Class                      ajd_to_jd   50
Class                        clfloor   50
Date                      __10417__   50
Integer                           to_i   50
Object                        Integer   50
Rational                         divmod   50
Rational                           to_i   50
Date                               51
Date                            ajd   51
Date                             jd   51
Rational                               51
Class                           new0   52
Date                     initialize   52
Integer                           to_r   52
Object         singleton_method_added   67
Date                          civil   75
Symbol                           to_i   91
Float                              *   96
Float                         coerce   96
Fixnum                              /   97
Object                        frozen?   100
Rational                              -   104
Fixnum                           to_s   123
Array                             []   141
Object                          class   150
Module                   method_added   154
Float                              /   186
Module                            ===   200
Rational                              /   204
Rational                              +   248
Float                          floor   282
Fixnum                             <<   306
Class                         reduce   356
Integer                            gcd   356
Object                       Rational   356
Fixnum                              +   414
Class                           new!   610
Rational                     initialize   610
Class                            new   612
Fixnum                            abs   712
Fixnum                            div   762
Fixnum                              *   1046
Fixnum                                 1970
Fixnum                              -   2398
Object                       kind_of?   2439
Fixnum                             >>   4698
Fixnum                             []   7689
Fixnum                             ==   11436

This may leave us with many questions. For example, there are a couple
of calls to construct new objects — where are they coming from? To
answer that question:

#pragma D option quiet
ruby$target:::function-entry
/copyinstr(arg1) == "initialize"/
{
@[copyinstr(arg0), copyinstr(arg2), arg3] = count();
}
END
{
printf("%-10s %-40s %-10s %s\n", "CLASS",
"INITIALIZED IN FILE", "AT LINE", "COUNT");
printa("%-10s %-40s %-10d %@d\n", @);
}

Calling the above whereinit.d, we can run it in a similar
manner:

# dtrace -s ./whereinit.d -c "../ruby ./cal.rb"
August 2005
S  M Tu  W Th  F  S
1  2  3  4  5  6
7  8  9 10 11 12 13
14 15 16 17 18 19 20
21 22 23 24 25 26 27
28 29 30 31
CLASS      INITIALIZED IN FILE                      AT LINE    COUNT
Cal        ./cal.rb                                 144        1
Date       /usr/local/lib/ruby/1.8/date.rb          593        1
Date       /usr/local/lib/ruby/1.8/date.rb          703        1
Date       /usr/local/lib/ruby/1.8/date.rb          916        1
Time       /usr/local/lib/ruby/1.8/date.rb          702        1
Date       /usr/local/lib/ruby/1.8/date.rb          901        49
Rational   /usr/local/lib/ruby/1.8/rational.rb      374        610

Looking at the Date class, it’s interesting to look at line 901 of
file /usr/local/lib/ruby/1.8/date.rb:

897   # If +n+ is not a Numeric, a TypeError will be thrown.  In
898   # particular, two Dates cannot be added to each other.
899   def + (n)
900     case n
   901     when Numeric; return self.class.new0(@ajd + n, @of, @sg)
902     end
903     raise TypeError, 'expected numeric'
904   end

This makes sense: we’re initializing new Date
instances in the +
method for Date. And where are those coming from?
It’s not hard to build a script that will tell us the file and line
for the call site of an arbitrary class and method:

#pragma D option quiet
ruby$target:::function-entry
/copyinstr(arg0) == $$1 && copyinstr(arg1) == $$2/
{
@[copyinstr(arg2), arg3] = count();
}
END
{
printf("%-40s %-10s %s\n", "FILE", "LINE", "COUNT");
printa("%-40s %-10d %@d\n", @);
}

For this particular example (Date#+()), call the above
wherecall.d and run it this way:

# dtrace -s ./wherecall.d "Date" "+" -c "../ruby ./cal.rb"
August 2005
S  M Tu  W Th  F  S
1  2  3  4  5  6
7  8  9 10 11 12 13
14 15 16 17 18 19 20
21 22 23 24 25 26 27
28 29 30 31
FILE                                     LINE       COUNT
./cal.rb                                 102        2
./cal.rb                                 60         6
./cal.rb                                 63         41

And looking at the indicated lines in cal.rb:

55   def pict(y, m)
56     d = (1..31).detect{|d| Date.valid_date?(y, m, d, @start)}
57     fi = Date.new(y, m, d, @start)
58     fi -= (fi.jd - @k + 1) % 7
59
    60     ve  = (fi..fi +  6).collect{|cu|
61       %w(S M Tu W Th F S)[cu.wday]
62     }
    63     ve += (fi..fi + 41).collect{|cu|
64       if cu.mon == m then cu.send(@da) end.to_s
65     }
66

So this is doing exactly what we would expect, given the code.
Now, if we were interested in making this perform a little better,
we might be interested to know the work that is being induced
by Date#+(). Here’s a script that reports the classes and
methods called by a given class/method — and its callees:

#pragma D option quiet
ruby$target:::function-entry
/copyinstr(arg0) == $$1 && copyinstr(arg1) == $$2/
{
self->date = 1;
}
ruby$target:::function-entry
/self->date/
{
@[strjoin(strjoin(copyinstr(arg0), "#"),
copyinstr(arg1))] = count();
}
ruby$target:::function-return
/copyinstr(arg0) == $$1 && copyinstr(arg1) == $$2/
{
self->date = 0;
ndates++;
}
END
{
normalize(@, ndates);
printf("Each call to %s#%s() induced:\n\n", $$1, $$2);
printa("%@8d call(s) to %s()\n", @);
}

Calling the above whatcalls.d, we can answer the question
about Date#+() this way:

# dtrace -s ./whatcalls.d "Date" "+" -c "../ruby ./cal.rb"
August 2005
S  M Tu  W Th  F  S
1  2  3  4  5  6
7  8  9 10 11 12 13
14 15 16 17 18 19 20
21 22 23 24 25 26 27
28 29 30 31
Each call to Date#+() induced:
1 call(s) to Class#new0()
1 call(s) to Class#reduce()
1 call(s) to Date#+()
1 call(s) to Date#initialize()
1 call(s) to Fixnum#+()
1 call(s) to Fixnum#<<()
1 call(s) to Integer#gcd()
1 call(s) to Module#===()
1 call(s) to Object#Rational()
1 call(s) to Object#class()
2 call(s) to Class#new()
2 call(s) to Class#new!()
2 call(s) to Fixnum#abs()
2 call(s) to Fixnum#div()
2 call(s) to Rational#+()
2 call(s) to Rational#initialize()
3 call(s) to Fixnum#*()
3 call(s) to Fixnum#()
23 call(s) to Fixnum#>>()
37 call(s) to Fixnum#[]()
52 call(s) to Fixnum#==()

That’s a lot of work for something that should be pretty simple! Indeed,
it’s counterintuitive that, say, Integer#gcd() would be called
from Date#+() — and it certainly seems suboptimal. I’ll leave
further exploration into this as an exercise to the reader, but suffice
it to say that this has to do with the use of a rational number in the
Date class –
the elimination of which would elminate most of the above calls and
presumably greatly improve the performance of Date#+().

Now, Ruby aficionados may note that some of the above functionality
has been available in Ruby by setting the
set_trace_func function (upon which the
Ruby profiler
is implemented). While that’s true (to a point — the set_trace_func
seems to be a pretty limited mechanism),
the Ruby DTrace provider is nonetheless a great lurch forward for
Ruby developers: it allows developers to use DTrace-specific constructs
like aggregations and thread-local variables to hone in on a problem;
it allows Ruby-related work performed lower in the stack (e.g.,
in the I/O subsystem, CPU dispatcher or network stack)
to be connected to the Ruby
code inducing it; it allows a running Ruby script to be
instrumented (and reinstrumented) without stopping or restarting it; and
it allows multiple, disjoint Ruby scripts to be coherently observed and
understood as a single entity. More succinctly, it’s just damned cool.
So thanks to Rich for developing the prototype provider — and if you’re
a Ruby developer, enjoy!

Posted on August 21, 2005 at 11:04 pm by bmc · Permalink
In: Solaris

34 Responses

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  1. Written by Tom Campanile
    on September 8, 2005 at 7:54 am
    Permalink

    My genitals are huge. You should see them!

  2. Written by Bryan Cantrill
    on September 8, 2005 at 11:00 am
    Permalink

    Unfortunately, the elephantiasis DTrace provider is still some ways off; I recommend that you seek medical attention in the interim.

  3. Written by Charles Oliver Nutter
    on October 3, 2006 at 3:36 pm
    Permalink

    Very interesting post, I’m going to have to read through it in more depth later.
    I’ve studied the C Ruby source enough to know that there’s many, many opportunities for improvement. We’re fixing these things in JRuby, so it will be very useful to have dtrace runs to show exactly what’s inefficient in C Ruby.
    We’re also interested in performance for JRuby too. General-purpose profiling has been yielding good results so far, but we know there’s more to do.

  4. Written by cvdxvd
    on November 3, 2006 at 6:03 am
    Permalink

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    [http://www.chinapaper.net/b2b/sader.asp?id=126234 轻型货架]
    [http://qtyracks.jewelchina.com/vip/ 货架]
    [http://www.163wz.com/company/about.asp?companyname=南京冠帝货架制造有限公司 货架]
    [http://www.163wz.com/viewproduct1.asp?id=1794&companyname=南京冠帝货架制造有限公司 货位货架]
    [http://www.163wz.com/viewproduct1.asp?id=1793&companyname=南京冠帝货架制造有限公司 中量B型货架]
    [http://www.163wz.com/viewproduct1.asp?id=1792&companyname=南京冠帝货架制造有限公司 轻型货架]
    [http://qtyracks.diytrade.com/ 货架]
    [http://qtyracks.diytrade.com/sdp/436675/2/pd-2438722/2173751-0.html 钢托盘]
    [http://qtyracks.diytrade.com/sdp/436675/2/pd-2438722/2173717-0.html 角钢货架]
    [http://qtyracks.diytrade.com/sdp/436675/2/pd-2438722/2173709-0.html 中量B型货架]
    [http://qtyracks.diytrade.com/sdp/436675/2/pd-2438722/2173715-0.html 仓库货架]
    [http://qtyracks.diytrade.com/sdp/436675/2/pd-2438722/2173706-0.html 中量A型货架]
    [http://qtyracks.diytrade.com/sdp/436675/2/pd-2438722/2173703-0.html 通廊货架]
    [http://qtyracks.diytrade.com/sdp/436675/2/pd-2438722/2173701-0.html 4S店货架]
    [http://qtyracks.diytrade.com/sdp/436675/2/pd-2438722/2173699-0.html 阁楼货架]
    [http://qtyracks.diytrade.com/sdp/436675/2/pd-2438722/2173694-0.html 悬臂货架]
    [http://vqtyracks.diytrade.com/sdp/436675/2/pd-2438722/2173692-0.html 抽屉货架]
    [http://qtyracks.diytrade.com/sdp/436675/2/pd-2438722/2173678-0.html 木托盘]
    [http://http://qtyracks.diytrade.com/sdp/436675/2/pd-2438722/2173683-0.html 线棒货架]
    [http://qtyracks.diytrade.com/sdp/436675/2/pd-2438722/2173667-0.html 塑木托盘]
    [http://qtyracks.diytrade.com/sdp/436675/2/pd-2438722/2173661-0.html 塑料托盘]
    [http://qtyracks.diytrade.com/sdp/436675/2/pd-2438722/2173658-0.html 登高车]
    [http://qtyracks.diytrade.com/sdp/436675/2/pd-2438722/2173652-0.html 物流台车 ]
    [http://qtyracks.diytrade.com/sdp/436675/2/pd-2438722/2153488-0.html 悬臂货架]
    [http://qtyracks.diytrade.com/sdp/436675/2/md-2438723/2173733.html 手推车]
    [http://qtyracks.diytrade.com/sdp/436675/2/md-2438723/2173738.html 料箱]
    [http://qtyracks.diytrade.com/sdp/436675/2/md-2438723/2153493.html 仓储笼]
    [http://qtyracks.100ye.com/ 货架]
    [http://qtyracks.100ye.com/sort/market/goods_display.asp?id=2182805 悬臂货架]
    [http://qtyracks.100ye.com/sort/market/goods_display.asp?id=2182803 贯通货架]
    [http://qtyracks.100ye.com/sort/market/goods_display.asp?id=2182801 阁楼货架]
    [http://qtyracks.100ye.com/sort/market/goods_display.asp?id=2182799 登高车]
    [http://qtyracks.100ye.com/sort/market/goods_display.asp?id=2182798 仓储笼]
    [http://qtyracks.100ye.com/sort/market/goods_display.asp?id=2182795 托盘]
    [http://qtyracks.100ye.com/sort/market/goods_display.asp?id=2182793 4S店货架]
    [http://qtyracks.100ye.com/sort/market/goods_display.asp?id=2182789 中型货架]
    [http://qtyracks.100ye.com/sort/market/goods_display.asp?id=2182785 货位货架]
    [http://qtyracks.100ye.com/sort/market/goods_display.asp?id=2182783 中型货架]
    [http://qtyracks.100ye.com/sort/market/goods_display.asp?id=2181645 轻型货架]
    [http://www.b2b168.com/c168-1758118.html 货架]
    [http://www.b2b168.com/s168-1652642.html 中型货架]
    [http://www.b2b168.com/s168-1652640.html 中量A型货架]
    [http://www.b2b168.com/s168-1651412.html 轻型货架]
    [http://qtyracks.qy6.com 货架]
    [http://www.qy6.com/syjh/showbus335438.html 中型货架]
    [http://www.qy6.com/syjh/showbus335436.html 中型货架]
    [http://www.qy6.com/syjh/showbus334784.html 角钢货架]
    [http://tw.bysources.com/company/show.php?supno=125939 货架]
    [http://chinese.bysources.com/sample/125939/6565.html 木托盘]
    [http://chinese.bysources.com/sample/125939/6566.html 悬臂货架]
    [http://chinese.bysources.com/sample/125939/6567.html 阁楼货架]
    [http://chinese.bysources.com/sample/125939/6568.html 中量A型货架]
    [http://chinese.bysources.com/sample/125939/6569.html 货位货架]
    [http://chinese.bysources.com/sample/125939/6570.html 中量B型货架]
    [http://chinese.bysources.com/sample/125939/6571.html 贯通货架]
    [http://chinese.bysources.com/sample/125939/6572.html 钢托盘]
    [http://chinese.bysources.com/sample/125939/6573.html 仓储笼]
    [http://chinese.bysources.com/sample/125939/6574.html 登高车]
    [http://co.163.com/neteaseivp/ecatalog/product_detail.jsp?way=1&productid=34778558 悬臂货架]
    [http://co.163.com/neteaseivp/ecatalog/product_detail.jsp?way=1&productid=34778554 模具货架]
    [http://co.163.com/neteaseivp/ecatalog/product_detail.jsp?way=4&productid=34778540 4S店货架]
    [http://co.163.com/neteaseivp/ecatalog/product_detail.jsp?way=3&productid=34778529 阁楼货架]
    [http://co.163.com/neteaseivp/ecatalog/product_detail.jsp?productid=34778522&way=2 线棒货架]
    [http://co.163.com/neteaseivp/ecatalog/product_detail.jsp?productid=34778506&way=1 塑料托盘]
    [http://co.163.com/neteaseivp/ecatalog/product_detail.jsp?productid=34778494&way=1 登高车]
    [http://co.163.com/neteaseivp/ecatalog/product_detail.jsp?productid=34778485&way=1 仓储笼]
    [http://co.163.com/neteaseivp/ecatalog/product_detail.jsp?productid=34778471&way=1 托盘]
    [http://co.163.com/neteaseivp/ecatalog/product_detail.jsp?productid=34778460&way=1 中型货架]
    [http://co.163.com/neteaseivp/ecatalog/product_detail.jsp?productid=34778442&way=1 中型货架]
    [http://co.163.com/neteaseivp/ecatalog/product_detail.jsp?productid=34778388&way=4 角钢货架]
    [http://www.valve168.com/co.asp?id=500 货架]
    [http://www.qtyracks.kudo.cn/ 货架]
    [http://www.b2bvip.com/b2bvip/index.asp?id=85327 货架]
    [http://jdxrack.cn.nowec.com 仓储设备]
    [http://china.nowec.com/product/detail/63072.html 塑料托盘]
    [http://china.nowec.com/product/detail/63065.html 料箱]
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    [http://china.nowec.com/product/detail/63063.html 物流台车]
    [http://china.nowec.com/product/detail/63062.html 堆垛架]
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    [http://china.nowec.com/product/detail/63044.html 轻型货架]
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    [http://china.nowec.com/supply/detail/514082.html 仓储笼]
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    [http://china.nowec.com/supply/detail/514132.html 4S店货架]
    [http://china.nowec.com/supply/detail/514138.html 线棒货架]
    [http://www.chinaqibao.net/co/?id=4419 货架]
    [http://www.chinaqibao.net/buy/buyview.aspx?id=34465 轻型货架]
    [http://www.chinaqibao.net/buy/buyview.aspx?id=34474 4S店货架]
    [http://www.chinaqibao.net/buy/buyview.aspx?id=34466 货位货架]
    [http://www.chinaqibao.net/buy/buyview.aspx?id=34472 手推车]
    [http://www.chinaqibao.net/buy/buyview.aspx?id=34473 登高车]
    [http://www.chinaqibao.net/buy/buyview.aspx?id=34285 阁楼货架]
    [http://www.chinaqibao.net/buy/buyview.aspx?id=34467 贯通货架]
    [http://www.chinaqibao.net/buy/buyview.aspx?id=34286 中型货架]
    [http://www.chinaqibao.net/buy/buyview.aspx?id=34287 汽配库货架]
    [http://qtyrack.b2b.hc360.com/ 货架]
    [http://qtyrack.b2b.hc360.com/supply/31917499.html 中型货架]
    [http://qtyrack.b2b.hc360.com/supply/31917489.html 中型货架]
    [http://qtyrack.b2b.hc360.com/supply/31917486.html 物流台车]
    [http://qtyrack.b2b.hc360.com/supply/31917484.html 仓储笼]
    [http://qtyrack.b2b.hc360.com/supply/31917482.html 登高车]
    [http://qtyrack.b2b.hc360.com/supply/31917479.html 手推车]
    [http://qtyrack.b2b.hc360.com/supply/31917476.html 塑料托盘]
    [http://qtyrack.b2b.hc360.com/supply/31917471.html 钢托盘]
    [http://qtyrack.b2b.hc360.com/supply/31917465.html 线棒货架]
    [http://qtyrack.b2b.hc360.com/supply/31917460.html 悬臂货架]
    [http://qtyrack.b2b.hc360.com/supply/31916910.html 模具货架]
    [http://qtyrack.b2b.hc360.com/supply/31916909.html 贯通货架]
    [http://qtyrack.b2b.hc360.com/supply/31916908.html 货位货架]
    [http://qtyrack.b2b.hc360.com/supply/31915596.html 托盘]
    [http://qtyrack.b2b.hc360.com/supply/31915567.html 轻型货架]

  29. Written by 123456
    on April 7, 2007 at 11:02 pm
    Permalink

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  30. Written by 123456
    on April 7, 2007 at 11:04 pm
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  31. Written by 阀门
    on May 30, 2007 at 12:52 am
    Permalink
  32. Written by 阀门
    on May 30, 2007 at 1:00 am
    Permalink

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