1 | #include <IO/createReadBufferFromFileBase.h> |
2 | #include <IO/ReadBufferFromFile.h> |
3 | #if defined(__linux__) || defined(__FreeBSD__) |
4 | #include <IO/ReadBufferAIO.h> |
5 | #endif |
6 | #include <Common/ProfileEvents.h> |
7 | |
8 | |
9 | namespace ProfileEvents |
10 | { |
11 | extern const Event CreatedReadBufferOrdinary; |
12 | extern const Event CreatedReadBufferAIO; |
13 | extern const Event CreatedReadBufferAIOFailed; |
14 | } |
15 | |
16 | namespace DB |
17 | { |
18 | |
19 | std::unique_ptr<ReadBufferFromFileBase> createReadBufferFromFileBase(const std::string & filename_, size_t estimated_size, |
20 | size_t aio_threshold, size_t buffer_size_, int flags_, char * existing_memory_, size_t alignment) |
21 | { |
22 | #if defined(__linux__) || defined(__FreeBSD__) |
23 | if (aio_threshold && estimated_size >= aio_threshold) |
24 | { |
25 | /// Attempt to open a file with O_DIRECT |
26 | try |
27 | { |
28 | auto res = std::make_unique<ReadBufferAIO>(filename_, buffer_size_, flags_, existing_memory_); |
29 | ProfileEvents::increment(ProfileEvents::CreatedReadBufferAIO); |
30 | return res; |
31 | } |
32 | catch (const ErrnoException &) |
33 | { |
34 | /// Fallback to cached IO if O_DIRECT is not supported. |
35 | ProfileEvents::increment(ProfileEvents::CreatedReadBufferAIOFailed); |
36 | } |
37 | } |
38 | #else |
39 | (void)aio_threshold; |
40 | (void)estimated_size; |
41 | #endif |
42 | |
43 | ProfileEvents::increment(ProfileEvents::CreatedReadBufferOrdinary); |
44 | return std::make_unique<ReadBufferFromFile>(filename_, buffer_size_, flags_, existing_memory_, alignment); |
45 | } |
46 | |
47 | } |
48 | |