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Re: [libmicrohttpd] Aync handling & message response

From: Kunal Ekawde
Subject: Re: [libmicrohttpd] Aync handling & message response
Date: Mon, 12 Nov 2018 18:54:11 +0530

Hi Christian,

I'm using following options, single threaded external epoll:
    auto mhdDaemon = MHD_start_daemon (MHD_USE_EPOLL |
            NULL, NULL, &Server::httpServerAccessHandlerCb, this,
            MHD_OPTION_SOCK_ADDR, &addr,
            MHD_OPTION_CONNECTION_LIMIT, maxConcrrntConn,
            MHD_OPTION_EXTERNAL_LOGGER, &Server::httpServerErrorHandler, this,
            MHD_OPTION_NOTIFY_COMPLETED, &Server::httpServerRequestCompleted, this,

Observing that MHD is not processing the upload data for few(other request are successfully completed) of the requests when there is data associated with it. e.g PUT/GET/DELETE with data < approx 2KB.
logs for ref:
 httpServerRequestCompleted:940: Request complete on txn:3522 termCode:0\"}

httpServerAccessHandlerCb:653: Incoming req, inserting txnId:3523 in map\"} -- new request
httpServerAccessHandlerCb:671: Incoming req, upload data size:1607\"}
httpServerRequestCompleted:940: Request complete on txn:3523 termCode:5\"}   -- doesn't process the uploaded data eventually error when client(libcurl) times out.

httpServerAccessHandlerCb:653: Incoming req, inserting txnId:3524 in map\"}\

Do you see any issue ?


On Sun, Sep 9, 2018 at 4:02 PM Christian Grothoff <address@hidden> wrote:
On 09/06/2018 08:19 AM, Kunal Ekawde wrote:
> Can you please provide some information on 'MHD_USE_TURBO' as I couldn't
> find any info in manual.

>From the manual:

@cindex performance
Enable optimizations to aggressively improve performance.

Currently, the optimizations this option enables are based on
opportunistic reads and writes.  Bascially, MHD will simply try to
read or write or accept on a socket before checking that the socket is
ready for IO using the event loop mechanism.  As the sockets are
non-blocking, this may fail (at a loss of performance), but generally
MHD does this in situations where the operation is likely to succeed,
in which case performance is improved.  Setting the flag should generally
be safe (even though the code is slightly more experimental).  You may
want to benchmark your application to see if this makes any difference
for you.


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