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Overview
| Comment: | Fix a typo in mmap.html. |
|---|---|
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
04448addda33fd313d320c1bb9cd669d |
| User & Date: | drh 2013-05-23 22:56:49 |
Context
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2013-05-28
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| 13:23 | Clarify the license for SQLite documentation. check-in: 419389e585 user: drh tags: trunk | |
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2013-05-23
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| 22:56 | Fix a typo in mmap.html. check-in: 04448addda user: drh tags: trunk | |
| 11:48 | Update the documentation for PRAGMA mmap_size to explain that it can sometimes be a no-op. check-in: a577a4e618 user: drh tags: trunk | |
Changes
Changes to pages/mmap.in.
53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 |
<li><p>Performance does not always increase with memory-mapped I/O. In fact,
it is possible to construct test cases where performance is reduced
by the use of memory-mapped I/O, though this is hard to do.</p>
</ol>
<p>Because of the potential disadvantages, memory-mapped I/O is turned
off by default. To active memory-mapped I/O, use the [mmap_size pragma]
and set the mmap_size to some large number, usually 256MB or larger, depending
on how much address space your application can spare. The rest is
automatic. The [PRAGMA mmap_size] statement will be a silent no-op on
systems that do not support memory-mapped I/O.</p>
<h2>How Memory-Mapped I/O Works</h2>
|
| |
53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 |
<li><p>Performance does not always increase with memory-mapped I/O. In fact,
it is possible to construct test cases where performance is reduced
by the use of memory-mapped I/O, though this is hard to do.</p>
</ol>
<p>Because of the potential disadvantages, memory-mapped I/O is turned
off by default. To activate memory-mapped I/O, use the [mmap_size pragma]
and set the mmap_size to some large number, usually 256MB or larger, depending
on how much address space your application can spare. The rest is
automatic. The [PRAGMA mmap_size] statement will be a silent no-op on
systems that do not support memory-mapped I/O.</p>
<h2>How Memory-Mapped I/O Works</h2>
|