From: Eric Wong <e@80x24.org>
To: David Turner <novalis@novalis.org>
Cc: Duy Nguyen <pclouds@gmail.com>, kamggg@gmail.com, git@vger.kernel.org
Subject: Re: [PATCH v12 04/20] index-helper: new daemon for caching index and related stuff
Date: Sun, 26 Jun 2016 23:25:00 +0000 [thread overview]
Message-ID: <20160626232500.GA3426@dcvr.yhbt.net> (raw)
In-Reply-To: <577015C5.8070407@novalis.org>
David Turner <novalis@novalis.org> wrote:
> On 06/26/2016 04:53 AM, Eric Wong wrote:
> >David Turner <novalis@novalis.org> wrote:
> >>On 06/25/2016 10:33 AM, Duy Nguyen wrote:
> >>>>+ /*
> >>>>+ * Our connection to the client is blocking since a client
> >>>>+ * can always be killed by SIGINT or similar.
> >>>>+ */
> >>>>+ set_socket_blocking_flag(client_fd, 0);
> >>>
> >>>Out of curiosity, do we really need this? I thought default behavior
> >>>was always blocking (and checked linux kernel, it seemed to agree with
> >>>me). Maybe for extra safety because other OSes may default to
> >>>something else?
> >>
> >>Yes -- see this bug report for details:
> >>https://bugs.python.org/issue7995
> >
> >I realize it's an issue with BSDs, but it still seems
> >unnecessary, here:
> >
> >1) the packet_read => get_packet_data => read_in_full => xread
> > call chain already poll()s on EAGAIN/EWOULDBLOCK.
> > write_in_full => xwrite busy loops on EAGAIN/EWOULDBLOCK.
> > xwrite should probably poll, too; but I guess EAGAIN is
> > uncommon with small writes.
>
> That is a CPU-burning busy loop on a non-blocking socket.
Indeed, fixes proposed in (xread was also broken(!)):
http://mid.gmane.org/20160626232112.721-3-e@80x24.org
http://mid.gmane.org/20160626232112.721-2-e@80x24.org
http://mid.gmane.org/20160626232112.721-1-e@80x24.org
next prev parent reply other threads:[~2016-06-26 23:25 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-19 21:45 [PATCH v12 00/20] index-helper/watchman David Turner
2016-05-19 21:45 ` [PATCH v12 01/20] read-cache.c: fix constness of verify_hdr() David Turner
2016-05-19 21:45 ` [PATCH v12 02/20] read-cache: allow to keep mmap'd memory after reading David Turner
2016-05-19 21:45 ` [PATCH v12 03/20] pkt-line: add gentle version of packet_write David Turner
2016-06-25 14:01 ` Duy Nguyen
2016-05-19 21:45 ` [PATCH v12 04/20] index-helper: new daemon for caching index and related stuff David Turner
2016-06-17 16:43 ` Christian Couder
2016-06-25 14:15 ` Duy Nguyen
2016-06-25 14:33 ` Duy Nguyen
2016-06-25 19:21 ` David Turner
2016-06-26 4:27 ` Duy Nguyen
2016-06-26 19:29 ` David Turner
2016-06-27 5:50 ` Duy Nguyen
2016-06-26 8:53 ` Eric Wong
2016-06-26 17:49 ` David Turner
2016-06-26 23:25 ` Eric Wong [this message]
2016-05-19 21:45 ` [PATCH v12 05/20] index-helper: add --strict David Turner
2016-06-25 14:43 ` Duy Nguyen
2016-05-19 21:45 ` [PATCH v12 06/20] daemonize(): set a flag before exiting the main process David Turner
2016-05-19 21:45 ` [PATCH v12 07/20] index-helper: add --detach David Turner
2016-06-25 14:46 ` Duy Nguyen
2016-05-19 21:45 ` [PATCH v12 08/20] index-helper: log warnings David Turner
2016-05-19 21:45 ` [PATCH v12 09/20] read-cache: add watchman 'WAMA' extension David Turner
2016-06-25 14:59 ` Duy Nguyen
2016-05-19 21:45 ` [PATCH v12 10/20] watchman: support watchman to reduce index refresh cost David Turner
2016-06-17 16:01 ` Christian Couder
2016-05-19 21:45 ` [PATCH v12 11/20] index-helper: use watchman to avoid refreshing index with lstat() David Turner
2016-06-17 13:02 ` Duy Nguyen
2016-06-17 21:39 ` David Turner
2016-06-19 5:07 ` [PATCH v12 11/20] index-helper: use watchman to avoid refreshing, " David Turner
2016-06-23 6:24 ` David Turner
2016-06-23 15:33 ` Duy Nguyen
2016-06-25 16:27 ` [PATCH v12 11/20] index-helper: use watchman to avoid refreshing " Duy Nguyen
2016-05-19 21:45 ` [PATCH v12 12/20] update-index: enable/disable watchman support David Turner
2016-06-25 16:31 ` Duy Nguyen
2016-05-19 21:45 ` [PATCH v12 13/20] unpack-trees: preserve index extensions David Turner
2016-05-19 21:45 ` [PATCH v12 14/20] watchman: add a config option to enable the extension David Turner
2016-05-19 21:45 ` [PATCH v12 15/20] index-helper: kill mode David Turner
2016-05-19 21:45 ` [PATCH v12 16/20] index-helper: don't run if already running David Turner
2016-06-17 16:18 ` Christian Couder
2016-05-19 21:45 ` [PATCH v12 17/20] index-helper: autorun mode David Turner
2016-06-25 16:35 ` Duy Nguyen
2016-05-19 21:45 ` [PATCH v12 18/20] index-helper: optionally automatically run David Turner
2016-06-25 16:38 ` Duy Nguyen
2016-05-19 21:45 ` [PATCH v12 19/20] trace: measure where the time is spent in the index-heavy operations David Turner
2016-05-19 21:45 ` [PATCH v12 20/20] index-helper: indexhelper.exitafter config David Turner
2016-06-25 13:28 ` [PATCH v12 00/20] index-helper/watchman Duy Nguyen
2016-06-25 16:42 ` Duy Nguyen
2016-06-26 4:08 ` David Turner
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