DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org E7854385BF9F
Date: Sun, 22 Mar 2020 03:21:35 +0000
To: "cygwin@cygwin.com" <cygwin@cygwin.com>
Subject: New pty implementation is really slow
Message-ID: <T2ea_w0xYVfOjY80lzLI17-jZsISnTZXfTh_jqEePHLNtgG2TCVMAovKFkBIEKhISLr9GFOIKSUixMgWa72iiqZLCDUCXVCJbAy3w7DGphU=@protonmail.com>
MIME-Version: 1.0
From: Joe via Cygwin <cygwin@cygwin.com>
Reply-To: Joe <joeworth@protonmail.com>
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
Sender: "Cygwin" <cygwin-bounces@cygwin.com>

I'm using cygwin 3.1.4 on Windows 10.

The new pseudo terminal stuff seems really slow.

For example:
$ time seq 10000
(output omitted)
real    0m23.510s
user    0m1.515s
sys     0m4.483s

If I minimize the mintty window while seq is running, it gets slightly better:
real    0m4.562s
user    0m0.390s
sys     0m1.202s

But when I set CYGWIN=disable_pcon before starting mintty, I get:
$ time seq 10000
(output omitted)
real    0m0.366s
user    0m0.109s
sys     0m0.093s

So the new implementation seems to be over 60 times slower than the old one.
--
Problem reports:      https://cygwin.com/problems.html
FAQ:                  https://cygwin.com/faq/
Documentation:        https://cygwin.com/docs.html
Unsubscribe info:     https://cygwin.com/ml/#unsubscribe-simple