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writecsv performance #3483

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ViralBShah opened this issue Jun 21, 2013 · 3 comments
Closed

writecsv performance #3483

ViralBShah opened this issue Jun 21, 2013 · 3 comments
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io Involving the I/O subsystem: libuv, read, write, etc. performance Must go faster

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@ViralBShah
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Now, readcsv is a whole lot faster, but writecsv is really slow. Perhaps the same kinds of issues as #3350.
@JeffBezanson
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Just tried a 435MB random number csv; reading it took 11 sec and writing it back out took 7 sec. Can you give a case where it is slow?

@ViralBShah
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Try the file in my home directory on julia.mit.edu. Read it and then write the result back.

ViralBShah added a commit that referenced this issue Jun 22, 2013
@ViralBShah
Merge pull request #3492 from tanmaykm/readcsv
9c94774 
buffered writedlm. substring print invokes write. fixes #3483
@ViralBShah
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Thanks @tanmaykm. Now, readcsv is as fast as DataFrames.readtable for UTF8 strings, and writecsv performance is significantly improved - 4x on my test file.

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@ViralBShah @JeffBezanson