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The principle behind speculative I/O is to speculatively try to perform I/O before registering the events in the system. This considerably reduces the number of calls to epoll_ctl() and sometimes even epoll_wait(), and manages to increase overall performance by about 10%. The new poller has been called "sepoll". It is used by default on Linux when it works. A corresponding option "nosepoll" and the command line argument "-ds" allow to disable it.
49 lines
1.4 KiB
C
49 lines
1.4 KiB
C
/*
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include/types/polling.h
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File descriptors and polling definitions.
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Copyright (C) 2000-2007 Willy Tarreau - w@1wt.eu
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation, version 2.1
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exclusively.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef _TYPES_POLLING_H
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#define _TYPES_POLLING_H
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/* for fd_set */
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#include <sys/time.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <common/config.h>
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/* poll mechanisms available */
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#define POLL_USE_SELECT (1<<0)
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#define POLL_USE_POLL (1<<1)
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#define POLL_USE_EPOLL (1<<2)
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#define POLL_USE_KQUEUE (1<<3)
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#define POLL_USE_SEPOLL (1<<4)
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extern int cfg_polling_mechanism; /* POLL_USE_{SELECT|POLL|EPOLL|KQUEUE|SEPOLL} */
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#endif /* _TYPES_POLLING_H */
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/*
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* Local variables:
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* c-indent-level: 8
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* c-basic-offset: 8
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* End:
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*/
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