Mosh's memory footprint becomes extremely large when pasting large inputs #482

tsuna opened this Issue Dec 24, 2013 · 4 comments


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tsuna commented Dec 24, 2013

I have 252KB in the paste buffer.

$ pbpaste | wc
    8064   44352  258108

When I paste this into a fresh mosh session, I see mosh-client's resident set size balloon to 5GB.


  • OS X 10.8.5 (Darwin damogran.local 12.5.0 Darwin Kernel Version 12.5.0: Sun Sep 29 13:33:47 PDT 2013; root:xnu-2050.48.12~1/RELEASE_X86_64 x86_64)
  • mosh 1.2.4 from Homebrew on the client
  • mosh 1.2.4 from mosh-1.2.4-1.fc14.x86_64.rpm on Fedora on the server
cgull commented Mar 23, 2015

I just tried reproducing this. On OS X 10.10 to an RPi2 running Raspbian, pasting the Mac's /etc/services (677KB) with command-V in Terminal, I saw Homebrew's 1.2.4 Mosh client bloat to 3GB of core (and later shrink to 121MB). When I tried this with my performance code in #531, though, mosh-client stays at 25MB. I don't know why; I don't think this code should have any positive effect on your problem. Could you try this code?

phmarek commented Jun 1, 2015

Confirmed the bug with the debian package 1.2.4a-1+b2.

cgull commented Dec 11, 2015

I've pulled #531. Can either of you report whether this problem still exists?

cgull commented May 25, 2016

Still a problem.
From a FreeBSD client running I saw my client bloat to 5+ GB and take about 45s CPU to transmit that same 677KB. Mosh's timeout message also appeared for most of that time.

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