From: Carlos <angus@...>
Date: 2004-07-03T08:01:16+09:00
Subject: Re: slow method searching?

[David Garamond <lists@zara.6.isreserved.com>, 2004-07-02 23.56 CEST]
> $ time ruby -e'a=(1..200000).to_a; a.classx'
> -e:1: undefined method `classx' for #<Array:0x4027c18c> (NoMethodError)
> 
> real    0m3.768s
> user    0m1.640s
> sys     0m0.010s
> 
> $ time ruby -e'a=(1..200000).to_a; b=nil; b.classx'
> -e:1: undefined method `classx' for nil:NilClass (NoMethodError)

In my computer, there is a noticeable delay between the "-e:1" and the rest
of the exception message.

During that time, there is a lot of "mremap" system calls whose meaning I
don't know (GC? OS swapping(?)? A very long longjmp(!?)?).

Before I paste the last lines of the strace, which show the mremaps, I will
write yet another paragraph (this), because if I'm going to waste internet
bandwidth with non-answers, I'll do it good :).

write(2, "-e:1", 4)                     = 4
brk(0)                                  = 0x8158000
brk(0x8187000)                          = 0x8187000
mmap2(NULL, 270336, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)
= 0x402d1000
brk(0)                                  = 0x8187000
brk(0)                                  = 0x8187000
brk(0x816b000)                          = 0x816b000
brk(0)                                  = 0x816b000
mremap(0x402d1000, 270336, 536576, MREMAP_MAYMOVE) = 0x402d1000
mremap(0x402d1000, 536576, 536576, MREMAP_MAYMOVE) = 0x402d1000
mremap(0x402d1000, 536576, 1069056, MREMAP_MAYMOVE) = 0x402d1000
mremap(0x402d1000, 1069056, 1069056, MREMAP_MAYMOVE) = 0x402d1000
mremap(0x402d1000, 1069056, 2134016, MREMAP_MAYMOVE) = 0x402d1000
write(2, ": ", 2)                       = 2
write(2, "undefined method lassx\' for #<"..., 49) = 49
write(2, " (", 2)                       = 2
write(2, "NoMethodError", 13)           = 13
write(2, ")\n", 2)                      = 2
exit_group(1)                           = ?

Good luck.