<div dir="ltr">Hi, Stu.<div><br></div><div style>Does your beam crash when you call lists:duplicate(<span style="font-family:arial,sans-serif;font-size:13px">100000000</span>, a) ?</div><div style><br></div><div style>The difference is lists:duplicate is tail-recursive while lists:seq and big_lists:make_list are body-recursive so you can hit some stack size limit, not lists length one.</div>
</div><div class="gmail_extra"><br><br><div class="gmail_quote">2013/3/27 Stu Bailey <span dir="ltr"><<a href="mailto:stu.bailey@gmail.com" target="_blank">stu.bailey@gmail.com</a>></span><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div>Hi all,</div><div><br></div><div>I have an 8 core MacBook Pro Retina Display with 16GB of memory. I am running R16B with no configure options...but I did install libatomic_ops-7.2 . I tried a very simple list allocation test which surprisingly failed with a list size of 100 million. I first made a list with 10 million integers. The beam hung on 100 million. Thinking it was something with lists:seq, I just wrote a dumb test to build big lists of single character atoms. That also failed at 100 million. Is there a known limitation to the size of lists in Erlang?</div>
<div><br></div><div><div>bash-3.2$ uname -a</div><div>Darwin myhost.local 12.3.0 Darwin Kernel Version 12.3.0: Sun Jan 6 22:37:10 PST 2013; root:xnu-2050.22.13~1/RELEASE_X86_64 x86_64</div></div><div><br></div><div>bash-3.2$ erl</div>
<div>Erlang R16B (erts-5.10.1) [source] [smp:8:8] [async-threads:10] [hipe] [kernel-poll:false]</div><div><br></div><div>My Erlang Environment</div><div>Eshell V5.10.1 (abort with ^G)</div><div>1> lists:seq(1,10000000).</div>
<div>[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,</div><div> 23,24,25,26,27,28,29|...]</div><div>2> lists:seq(1,100000000). </div><div>beam.smp(85491,0xb039d000) malloc: *** mmap(size=458227712) failed (error code=12)</div>
<div> *** error: can't allocate region</div><div> *** set a breakpoint in malloc_error_break to debug</div>
<div> beam.smp(85491,0xb039d000) malloc: *** mmap(size=659554304) failed (error code=12)</div><div> *** error: can't allocate region</div>
<div> *** set a breakpoint in malloc_error_break to debug</div><div> beam.smp(85491,0xb039d000) malloc: *** mmap(size=791674880) failed (error code=12)</div>
<div> *** error: can't allocate region</div><div> *** set a breakpoint in malloc_error_break to debug</div>
<div> beam.smp(85491,0xb039d000) malloc: *** mmap(size=791674880) failed (error code=12)</div><div> *** error: can't allocate region</div>
<div> *** set a breakpoint in malloc_error_break to debug</div><div> beam.smp(85491,0xb039d000) malloc: *** mmap(size=791674880) failed (error code=12)</div>
<div> *** error: can't allocate region</div><div> *** set a breakpoint in malloc_error_break to debug</div>
<div> beam.smp(85491,0xb039d000) malloc: *** mmap(size=790962176) failed (error code=12)</div><div> *** error: can't allocate region</div>
<div> *** set a breakpoint in malloc_error_break to debug</div><div>
beam.smp(85491,0xb039d000) malloc: *** mmap(size=790962176) failed (error code=12)</div><div> *** error: can't allocate region</div>
<div> *** set a breakpoint in malloc_error_break to debug</div><div> Killed: 9</div><div><br></div><div><br></div><div>================</div><div><br></div><div>
<div>
-module(big_lists).</div><div><br></div><div>-compile([export_all]).</div><div><br></div><div><br></div><div>make_list(0,Acc)-></div><div> Acc;</div><div>make_list(Size,Acc) -></div><div> make_list(Size-1, [a] ++ Acc).</div>
</div><div><br></div><div>===================</div><div><br></div><div><div>5> c(big_lists). </div><div>{ok,big_lists}</div><div>6> big_lists:make_list(2,[]).</div><div>[a,a]</div><div>7> big_lists:make_list(100000,[]).</div>
<div>[a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a|...]</div><div>8> big_lists:make_list(1000000,[]).</div><div>[a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a|...]</div><div>9> big_lists:make_list(10000000,[]).</div>
<div>[a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a|...]</div><div>10> big_lists:make_list(100000000,[]).</div><div>beam.smp(85534,0xb039d000) malloc: *** mmap(size=381681664) failed (error code=12)</div><div>
*** error: can't allocate region</div><div> *** set a breakpoint in malloc_error_break to debug</div>
<div> beam.smp(85534,0xb039d000) malloc: *** mmap(size=659554304) failed (error code=12)</div><div> *** error: can't allocate region</div>
<div> *** set a breakpoint in malloc_error_break to debug</div><div> beam.smp(85534,0xb039d000) malloc: *** mmap(size=791674880) failed (error code=12)</div>
<div> *** error: can't allocate region</div><div> *** set a breakpoint in malloc_error_break to debug</div>
<div> [a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a|...]</div><div>beam.smp(85534,0xb039d000) malloc: *** mmap(size=950009856) failed (error code=12)</div><div> *** error: can't allocate region</div>
<div> *** set a breakpoint in malloc_error_break to debug</div><div> beam.smp(85534,0xb039d000) malloc: *** mmap(size=950009856) failed (error code=12)</div>
<div> *** error: can't allocate region</div><div> *** set a breakpoint in malloc_error_break to debug</div>
<div> beam.smp(85534,0xb039d000) malloc: *** mmap(size=949153792) failed (error code=12)</div><div> *** error: can't allocate region</div>
<div> *** set a breakpoint in malloc_error_break to debug</div><div> beam.smp(85534,0xb039d000) malloc: *** mmap(size=949153792) failed (error code=12)</div>
<div> *** error: can't allocate region</div><div> *** set a breakpoint in malloc_error_break to debug</div>
<div><br></div><div>Crash dump was written to: erl_crash.dump</div><div>eheap_alloc: Cannot allocate 949152844 bytes of memory (of type "heap").</div><div>Abort trap: 6</div></div><div><br></div>
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