How to find size of atomic write for nginx access log buffer?What is the size of an atomic write to disk on...
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How to find size of atomic write for nginx access log buffer?
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This link says:
The buffer size must not exceed the size of an atomic write to a disk file. For FreeBSD this size is unlimited.
How can I find size of atomic write on my server? Is there any command to check this?
linux nginx logging ubuntu-14.04
asked May 25 '15 at 12:33
g13g13
163
bumped to the homepage by Community♦ 3 mins ago
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
add a comment |
This link says:
The buffer size must not exceed the size of an atomic write to a disk file. For FreeBSD this size is unlimited.
How can I find size of atomic write on my server? Is there any command to check this?
linux nginx logging ubuntu-14.04
asked May 25 '15 at 12:33
g13g13
163
bumped to the homepage by Community♦ 3 mins ago
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
possible duplicate of What is the size of an atomic write to disk on my system?
– mvillar
May 25 '15 at 12:53
1
@mvillar I have read answer of the question you mentioned. It doesn't answer my needs. It is telling about the largest atomic write at the block level.
– g13
May 25 '15 at 13:05
@g13 You are right. That answer is useless. (I even pointed that out when it was originally posted).
– kasperd
May 26 '15 at 13:54
@kasperd, I have few more doubts about nginx access logs like what if I have different access logs, is this buffer size individual for each access log or shared? I can't find any good documentation regarding this issue.
– g13
May 26 '15 at 16:45
@g13 That is a different question altogether. The question about what sizes of writes are guaranteed to be atomic is a question about kernel and file system, in reallity it is completely unrelated to nginx. Your second question sounds like it is actually about nginx, and that I don't know anything about. Be aware that if you ask a question about where to find documentation, it is likely to be closed as off-topic. But if you mention which documentation you read and what questions you are left with after reading the documentation, then you have a much better chance at getting an answer.
– kasperd
May 26 '15 at 17:55
add a comment |
This link says:
The buffer size must not exceed the size of an atomic write to a disk file. For FreeBSD this size is unlimited.
How can I find size of atomic write on my server? Is there any command to check this?
linux nginx logging ubuntu-14.04
asked May 25 '15 at 12:33
g13g13
163
This link says:
The buffer size must not exceed the size of an atomic write to a disk file. For FreeBSD this size is unlimited.
How can I find size of atomic write on my server? Is there any command to check this?
linux nginx logging ubuntu-14.04
linux nginx logging ubuntu-14.04
asked May 25 '15 at 12:33
g13g13
163
asked May 25 '15 at 12:33
g13g13
163
edited May 26 '15 at 16:41
g13
asked May 25 '15 at 12:33
g13g13
163
asked May 25 '15 at 12:33
g13g13
163
asked May 25 '15 at 12:33
g13g13
163
163
bumped to the homepage by Community♦ 3 mins ago
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
bumped to the homepage by Community♦ 3 mins ago
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
possible duplicate of What is the size of an atomic write to disk on my system?
– mvillar
May 25 '15 at 12:53
1
@mvillar I have read answer of the question you mentioned. It doesn't answer my needs. It is telling about the largest atomic write at the block level.
– g13
May 25 '15 at 13:05
@g13 You are right. That answer is useless. (I even pointed that out when it was originally posted).
– kasperd
May 26 '15 at 13:54
@kasperd, I have few more doubts about nginx access logs like what if I have different access logs, is this buffer size individual for each access log or shared? I can't find any good documentation regarding this issue.
– g13
May 26 '15 at 16:45
@g13 That is a different question altogether. The question about what sizes of writes are guaranteed to be atomic is a question about kernel and file system, in reallity it is completely unrelated to nginx. Your second question sounds like it is actually about nginx, and that I don't know anything about. Be aware that if you ask a question about where to find documentation, it is likely to be closed as off-topic. But if you mention which documentation you read and what questions you are left with after reading the documentation, then you have a much better chance at getting an answer.
– kasperd
May 26 '15 at 17:55
add a comment |
possible duplicate of What is the size of an atomic write to disk on my system?
– mvillar
May 25 '15 at 12:53
1
@mvillar I have read answer of the question you mentioned. It doesn't answer my needs. It is telling about the largest atomic write at the block level.
– g13
May 25 '15 at 13:05
@g13 You are right. That answer is useless. (I even pointed that out when it was originally posted).
– kasperd
May 26 '15 at 13:54
@kasperd, I have few more doubts about nginx access logs like what if I have different access logs, is this buffer size individual for each access log or shared? I can't find any good documentation regarding this issue.
– g13
May 26 '15 at 16:45
@g13 That is a different question altogether. The question about what sizes of writes are guaranteed to be atomic is a question about kernel and file system, in reallity it is completely unrelated to nginx. Your second question sounds like it is actually about nginx, and that I don't know anything about. Be aware that if you ask a question about where to find documentation, it is likely to be closed as off-topic. But if you mention which documentation you read and what questions you are left with after reading the documentation, then you have a much better chance at getting an answer.
– kasperd
May 26 '15 at 17:55
possible duplicate of What is the size of an atomic write to disk on my system?
– mvillar
May 25 '15 at 12:53
possible duplicate of What is the size of an atomic write to disk on my system?
– mvillar
May 25 '15 at 12:53
1
1
@mvillar I have read answer of the question you mentioned. It doesn't answer my needs. It is telling about the largest atomic write at the block level.
– g13
May 25 '15 at 13:05
@mvillar I have read answer of the question you mentioned. It doesn't answer my needs. It is telling about the largest atomic write at the block level.
– g13
May 25 '15 at 13:05
@g13 You are right. That answer is useless. (I even pointed that out when it was originally posted).
– kasperd
May 26 '15 at 13:54
@g13 You are right. That answer is useless. (I even pointed that out when it was originally posted).
– kasperd
May 26 '15 at 13:54
@kasperd, I have few more doubts about nginx access logs like what if I have different access logs, is this buffer size individual for each access log or shared? I can't find any good documentation regarding this issue.
– g13
May 26 '15 at 16:45
@kasperd, I have few more doubts about nginx access logs like what if I have different access logs, is this buffer size individual for each access log or shared? I can't find any good documentation regarding this issue.
– g13
May 26 '15 at 16:45
@g13 That is a different question altogether. The question about what sizes of writes are guaranteed to be atomic is a question about kernel and file system, in reallity it is completely unrelated to nginx. Your second question sounds like it is actually about nginx, and that I don't know anything about. Be aware that if you ask a question about where to find documentation, it is likely to be closed as off-topic. But if you mention which documentation you read and what questions you are left with after reading the documentation, then you have a much better chance at getting an answer.
– kasperd
May 26 '15 at 17:55
@g13 That is a different question altogether. The question about what sizes of writes are guaranteed to be atomic is a question about kernel and file system, in reallity it is completely unrelated to nginx. Your second question sounds like it is actually about nginx, and that I don't know anything about. Be aware that if you ask a question about where to find documentation, it is likely to be closed as off-topic. But if you mention which documentation you read and what questions you are left with after reading the documentation, then you have a much better chance at getting an answer.
– kasperd
May 26 '15 at 17:55
add a comment |
1 Answer
1
active
oldest
votes
I was trying to find out size of an atomic write in Linux myself and the most helpful reading was from this Unix Stack Exchange answer
But in summary
This is from man 7 pipe.
POSIX.1-2001 says that write(2)s of less than PIPE_BUF bytes must be
atomic: the output data is written to the pipe as a contiguous
sequence. Writes of more than PIPE_BUF bytes may be nonatomic: the
kernel may interleave the data with data written by other processes.
POSIX.1-2001 requires PIPE_BUF to be at least 512 bytes. (On Linux,
PIPE_BUF is 4096 bytes.)
So in Linux the size of an atomic write is 4096 bytes.
You can find a nice table of the PIPE_BUF size for different OS'es here
http://ar.to/notes/posix#pipe-buf.
edited Apr 13 '17 at 12:37
Community♦
1
answered Nov 3 '15 at 15:59
RabooRaboo
834
add a comment |
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I was trying to find out size of an atomic write in Linux myself and the most helpful reading was from this Unix Stack Exchange answer
But in summary
This is from man 7 pipe.
POSIX.1-2001 says that write(2)s of less than PIPE_BUF bytes must be
atomic: the output data is written to the pipe as a contiguous
sequence. Writes of more than PIPE_BUF bytes may be nonatomic: the
kernel may interleave the data with data written by other processes.
POSIX.1-2001 requires PIPE_BUF to be at least 512 bytes. (On Linux,
PIPE_BUF is 4096 bytes.)
So in Linux the size of an atomic write is 4096 bytes.
You can find a nice table of the PIPE_BUF size for different OS'es here
http://ar.to/notes/posix#pipe-buf.
edited Apr 13 '17 at 12:37
Community♦
1
answered Nov 3 '15 at 15:59
RabooRaboo
834
add a comment |
I was trying to find out size of an atomic write in Linux myself and the most helpful reading was from this Unix Stack Exchange answer
But in summary
This is from man 7 pipe.
POSIX.1-2001 says that write(2)s of less than PIPE_BUF bytes must be
atomic: the output data is written to the pipe as a contiguous
sequence. Writes of more than PIPE_BUF bytes may be nonatomic: the
kernel may interleave the data with data written by other processes.
POSIX.1-2001 requires PIPE_BUF to be at least 512 bytes. (On Linux,
PIPE_BUF is 4096 bytes.)
So in Linux the size of an atomic write is 4096 bytes.
You can find a nice table of the PIPE_BUF size for different OS'es here
http://ar.to/notes/posix#pipe-buf.
edited Apr 13 '17 at 12:37
Community♦
1
answered Nov 3 '15 at 15:59
RabooRaboo
834
add a comment |
I was trying to find out size of an atomic write in Linux myself and the most helpful reading was from this Unix Stack Exchange answer
But in summary
This is from man 7 pipe.
POSIX.1-2001 says that write(2)s of less than PIPE_BUF bytes must be
atomic: the output data is written to the pipe as a contiguous
sequence. Writes of more than PIPE_BUF bytes may be nonatomic: the
kernel may interleave the data with data written by other processes.
POSIX.1-2001 requires PIPE_BUF to be at least 512 bytes. (On Linux,
PIPE_BUF is 4096 bytes.)
So in Linux the size of an atomic write is 4096 bytes.
You can find a nice table of the PIPE_BUF size for different OS'es here
http://ar.to/notes/posix#pipe-buf.
edited Apr 13 '17 at 12:37
Community♦
1
answered Nov 3 '15 at 15:59
RabooRaboo
834
I was trying to find out size of an atomic write in Linux myself and the most helpful reading was from this Unix Stack Exchange answer
But in summary
This is from man 7 pipe.
POSIX.1-2001 says that write(2)s of less than PIPE_BUF bytes must be
atomic: the output data is written to the pipe as a contiguous
sequence. Writes of more than PIPE_BUF bytes may be nonatomic: the
kernel may interleave the data with data written by other processes.
POSIX.1-2001 requires PIPE_BUF to be at least 512 bytes. (On Linux,
PIPE_BUF is 4096 bytes.)
So in Linux the size of an atomic write is 4096 bytes.
You can find a nice table of the PIPE_BUF size for different OS'es here
http://ar.to/notes/posix#pipe-buf.
edited Apr 13 '17 at 12:37
Community♦
1
answered Nov 3 '15 at 15:59
RabooRaboo
834
edited Apr 13 '17 at 12:37
Community♦
1
edited Apr 13 '17 at 12:37
Community♦
1
edited Apr 13 '17 at 12:37
Community♦
1
1
answered Nov 3 '15 at 15:59
RabooRaboo
834
answered Nov 3 '15 at 15:59
RabooRaboo
834
answered Nov 3 '15 at 15:59
RabooRaboo
834
834
add a comment |
add a comment |
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possible duplicate of What is the size of an atomic write to disk on my system?
– mvillar
May 25 '15 at 12:53
1
@mvillar I have read answer of the question you mentioned. It doesn't answer my needs. It is telling about the largest atomic write at the block level.
– g13
May 25 '15 at 13:05
@g13 You are right. That answer is useless. (I even pointed that out when it was originally posted).
– kasperd
May 26 '15 at 13:54
@kasperd, I have few more doubts about nginx access logs like what if I have different access logs, is this buffer size individual for each access log or shared? I can't find any good documentation regarding this issue.
– g13
May 26 '15 at 16:45
@g13 That is a different question altogether. The question about what sizes of writes are guaranteed to be atomic is a question about kernel and file system, in reallity it is completely unrelated to nginx. Your second question sounds like it is actually about nginx, and that I don't know anything about. Be aware that if you ask a question about where to find documentation, it is likely to be closed as off-topic. But if you mention which documentation you read and what questions you are left with after reading the documentation, then you have a much better chance at getting an answer.
– kasperd
May 26 '15 at 17:55