Re: [Gluster-devel] Confusing the clients with echo, mv and cat

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Re: [Gluster-devel] Confusing the clients with echo, mv and cat

From:	Anand Avati
Subject:	Re: [Gluster-devel] Confusing the clients with echo, mv and cat
Date:	Thu, 27 Sep 2007 21:44:55 +0530
David,
 thanks for your help. There was a bug in the glfs patched fuse and a fixed
version is uploaded at -

http://ftp.zresearch.com/pub/gluster/glusterfs/fuse/

Please try the glfs4 version and it now handles block splits more correctly.

Thanks!
avati

On 9/9/07, David Rotermund <address@hidden> wrote:
>
> Hi,
>
> we generated some strace files. The whole thing is getting even more
> strange.
>
> The program write_staticmem.c is able to write
> on ext3: (4 MB chunks) [output_staticmem_ext3.txt] and
> on clusterfs: (1MB chunks [output_staticmem_glusterfs_1MB.txt]
> and 4 MB chunks [output_staticmem_glusterfs_4MB.txt]).
>
> So far so good.
>
> The program write_dynamicmem.c is able to write
> on ext3 (4 MB chunks) [output_dynamicmem_ext3.txt] and
> on clusterfs (1MB chunks [output_dynamicmem_glusterfs_1MB.txt]).
> But writing 4MB chunks [output_dynamicmem_glusterfs_4MB.txt] on
> glusterfs is NOT (!) possible.
>
> Thank you for your help!
>
> best regards
> David
>
>
> Anand Avati schrieb:
> > David,
> >  can you post an strace of the program execution where 2MB fwrite()
> failed?
> >
> > thanks,
> > avati
> >
> > 2007/9/9, David Rotermund <address@hidden
> > <mailto:address@hidden>>:
> >
> >     Hi,
> >
> >     I downloaded and installed:
> >     glusterfs-1.3.1.tar.gz (718945 Bytes; ./configure --prefix=/usr
> >     --disable-ibverbs)
> >     and
> >     fuse-2.7.0-glfs3.tar.gz (517370 Bytes; ./configure
> >     --enable-kernel-module )
> >
> >
> >     best regards
> >     David
> >
> >     Anand Avati schrieb:
> >      >
> >      >      > Please try upgrading to the lastest FUSE (including kernel
> >      >     module) at -
> >      >      > http://ftp.zresearch.com/pub/gluster/glusterfs/fuse/
> >      >      > (the latest is glfs3 patched). The newer fuse gets less
> >     surprised
> >      >      > detecting changed inode numbers.
> >      >
> >      >     Thank you!
> >      >
> >      >     This error is gone but was replaced by another ugly problem.
> >     If we try
> >      >     to write with fwrite a block of data which is larger than 2
> >     MByte then
> >      >     we only get a empty file as result (fwrite also reports that
> >     0 Bytes
> >      >     have been written). Smaller block-sizes like e.g.
> >     (1024*1024*2)-1 are
> >      >     working. This is very confusing.
> >      >
> >      >     Is this a known problem?
> >      >
> >      >
> >      > are you using glfs3 or older version?
> >      >
> >      > avati
> >      >
> >      > --
> >      > It always takes longer than you expect, even when you take into
> >     account
> >      > Hofstadter's Law.
> >      >
> >      > -- Hofstadter's Law
> >
> >
> >
> >
> > --
> > It always takes longer than you expect, even when you take into account
> > Hofstadter's Law.
> >
> > -- Hofstadter's Law
>
>
> execve("/home/udo/Desktop/Testqueue/write_dynamicmem",
> ["/home/udo/Desktop/Testqueue/writ"...], [/* 28 vars */]) = 0
> brk(0)                                  = 0x601000
> mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
> 0x2aaaaaaab000
> uname({sys="Linux", node="nc7", ...})   = 0
> access("/etc/ld.so.preload", R_OK)      = -1 ENOENT (No such file or
> directory)
> open("/etc/ld.so.cache", O_RDONLY)      = 3
> fstat(3, {st_mode=S_IFREG|0644, st_size=142108, ...}) = 0
> mmap(NULL, 142108, PROT_READ, MAP_PRIVATE, 3, 0) = 0x2aaaaaaac000
> close(3)                                = 0
> open("/lib64/libc.so.6", O_RDONLY)      = 3
> read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\300\333"..., 832)
> = 832
> fstat(3, {st_mode=S_IFREG|0755, st_size=1689824, ...}) = 0
> mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
> 0x2aaaaaacf000
> mmap(0x32f7200000, 3469528, PROT_READ|PROT_EXEC,
> MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x32f7200000
> mprotect(0x32f7347000, 2093056, PROT_NONE) = 0
> mmap(0x32f7546000, 20480, PROT_READ|PROT_WRITE,
> MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x146000) = 0x32f7546000
> mmap(0x32f754b000, 16600, PROT_READ|PROT_WRITE,
> MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x32f754b000
> close(3)                                = 0
> mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
> 0x2aaaaaad0000
> arch_prctl(ARCH_SET_FS, 0x2aaaaaad0230) = 0
> mprotect(0x32f7546000, 16384, PROT_READ) = 0
> mprotect(0x32f6419000, 4096, PROT_READ) = 0
> munmap(0x2aaaaaaac000, 142108)          = 0
> mmap(NULL, 4198400, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
> 0) = 0x2aaaaaad1000
> brk(0)                                  = 0x601000
> brk(0x622000)                           = 0x622000
> open("test.dat", O_WRONLY|O_CREAT|O_TRUNC, 0666) = 3
> fstat(3, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0
> mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
> 0x2aaaaaed2000
> write(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"...,
> 4194304) = 4194304
> close(3)                                = 0
> munmap(0x2aaaaaed2000, 4096)            = 0
> fstat(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 0), ...}) = 0
> mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
> 0x2aaaaaed2000
> write(1, "Wrote 4194304 bytes.\n", 21)  = 21
> munmap(0x2aaaaaad1000, 4198400)         = 0
> exit_group(0)                           = ?
>
> execve("/home/udo/Desktop/Testqueue/write_dynamicmem",
> ["/home/udo/Desktop/Testqueue/writ"...], [/* 28 vars */]) = 0
> brk(0)                                  = 0x601000
> mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
> 0x2aaaaaaab000
> uname({sys="Linux", node="nc7", ...})   = 0
> access("/etc/ld.so.preload", R_OK)      = -1 ENOENT (No such file or
> directory)
> open("/etc/ld.so.cache", O_RDONLY)      = 3
> fstat(3, {st_mode=S_IFREG|0644, st_size=142108, ...}) = 0
> mmap(NULL, 142108, PROT_READ, MAP_PRIVATE, 3, 0) = 0x2aaaaaaac000
> close(3)                                = 0
> open("/lib64/libc.so.6", O_RDONLY)      = 3
> read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\300\333"..., 832)
> = 832
> fstat(3, {st_mode=S_IFREG|0755, st_size=1689824, ...}) = 0
> mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
> 0x2aaaaaacf000
> mmap(0x32f7200000, 3469528, PROT_READ|PROT_EXEC,
> MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x32f7200000
> mprotect(0x32f7347000, 2093056, PROT_NONE) = 0
> mmap(0x32f7546000, 20480, PROT_READ|PROT_WRITE,
> MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x146000) = 0x32f7546000
> mmap(0x32f754b000, 16600, PROT_READ|PROT_WRITE,
> MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x32f754b000
> close(3)                                = 0
> mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
> 0x2aaaaaad0000
> arch_prctl(ARCH_SET_FS, 0x2aaaaaad0230) = 0
> mprotect(0x32f7546000, 16384, PROT_READ) = 0
> mprotect(0x32f6419000, 4096, PROT_READ) = 0
> munmap(0x2aaaaaaac000, 142108)          = 0
> mmap(NULL, 1052672, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
> 0) = 0x2aaaaaad1000
> brk(0)                                  = 0x601000
> brk(0x622000)                           = 0x622000
> open("test.dat", O_WRONLY|O_CREAT|O_TRUNC, 0666) = 3
> fstat(3, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0
> mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
> 0) = 0x2aaaaabd2000
> write(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"...,
> 1048576) = 1048576
> close(3)                                = 0
> munmap(0x2aaaaabd2000, 1048576)         = 0
> fstat(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 0), ...}) = 0
> mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
> 0x2aaaaabd2000
> write(1, "Wrote 1048576 bytes.\n", 21)  = 21
> munmap(0x2aaaaaad1000, 1052672)         = 0
> exit_group(0)                           = ?
>
> execve("/home/udo/Desktop/Testqueue/write_dynamicmem",
> ["/home/udo/Desktop/Testqueue/writ"...], [/* 28 vars */]) = 0
> brk(0)                                  = 0x601000
> mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
> 0x2aaaaaaab000
> uname({sys="Linux", node="nc7", ...})   = 0
> access("/etc/ld.so.preload", R_OK)      = -1 ENOENT (No such file or
> directory)
> open("/etc/ld.so.cache", O_RDONLY)      = 3
> fstat(3, {st_mode=S_IFREG|0644, st_size=142108, ...}) = 0
> mmap(NULL, 142108, PROT_READ, MAP_PRIVATE, 3, 0) = 0x2aaaaaaac000
> close(3)                                = 0
> open("/lib64/libc.so.6", O_RDONLY)      = 3
> read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\300\333"..., 832)
> = 832
> fstat(3, {st_mode=S_IFREG|0755, st_size=1689824, ...}) = 0
> mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
> 0x2aaaaaacf000
> mmap(0x32f7200000, 3469528, PROT_READ|PROT_EXEC,
> MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x32f7200000
> mprotect(0x32f7347000, 2093056, PROT_NONE) = 0
> mmap(0x32f7546000, 20480, PROT_READ|PROT_WRITE,
> MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x146000) = 0x32f7546000
> mmap(0x32f754b000, 16600, PROT_READ|PROT_WRITE,
> MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x32f754b000
> close(3)                                = 0
> mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
> 0x2aaaaaad0000
> arch_prctl(ARCH_SET_FS, 0x2aaaaaad0230) = 0
> mprotect(0x32f7546000, 16384, PROT_READ) = 0
> mprotect(0x32f6419000, 4096, PROT_READ) = 0
> munmap(0x2aaaaaaac000, 142108)          = 0
> mmap(NULL, 4198400, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
> 0) = 0x2aaaaaad1000
> brk(0)                                  = 0x601000
> brk(0x622000)                           = 0x622000
> open("test.dat", O_WRONLY|O_CREAT|O_TRUNC, 0666) = 3
> fstat(3, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0
> mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
> 0) = 0x2aaaaaed2000
> write(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"...,
> 4194304) = -1 EIO (Input/output error)
> close(3)                                = 0
> munmap(0x2aaaaaed2000, 1048576)         = 0
> fstat(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 0), ...}) = 0
> mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
> 0x2aaaaaed2000
> write(1, "Wrote 0 bytes.\n", 15)        = 15
> munmap(0x2aaaaaad1000, 4198400)         = 0
> exit_group(0)                           = ?
>
> execve("/home/udo/Desktop/Testqueue/write_staticmem",
> ["/home/udo/Desktop/Testqueue/writ"...], [/* 28 vars */]) = 0
> brk(0)                                  = 0xa01000
> mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
> 0x2aaaaaaab000
> uname({sys="Linux", node="nc7", ...})   = 0
> access("/etc/ld.so.preload", R_OK)      = -1 ENOENT (No such file or
> directory)
> open("/etc/ld.so.cache", O_RDONLY)      = 3
> fstat(3, {st_mode=S_IFREG|0644, st_size=142108, ...}) = 0
> mmap(NULL, 142108, PROT_READ, MAP_PRIVATE, 3, 0) = 0x2aaaaaaac000
> close(3)                                = 0
> open("/lib64/libc.so.6", O_RDONLY)      = 3
> read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\300\333"..., 832)
> = 832
> fstat(3, {st_mode=S_IFREG|0755, st_size=1689824, ...}) = 0
> mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
> 0x2aaaaaacf000
> mmap(0x32f7200000, 3469528, PROT_READ|PROT_EXEC,
> MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x32f7200000
> mprotect(0x32f7347000, 2093056, PROT_NONE) = 0
> mmap(0x32f7546000, 20480, PROT_READ|PROT_WRITE,
> MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x146000) = 0x32f7546000
> mmap(0x32f754b000, 16600, PROT_READ|PROT_WRITE,
> MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x32f754b000
> close(3)                                = 0
> mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
> 0x2aaaaaad0000
> arch_prctl(ARCH_SET_FS, 0x2aaaaaad0230) = 0
> mprotect(0x32f7546000, 16384, PROT_READ) = 0
> mprotect(0x32f6419000, 4096, PROT_READ) = 0
> munmap(0x2aaaaaaac000, 142108)          = 0
> brk(0)                                  = 0xa01000
> brk(0xa22000)                           = 0xa22000
> open("test.dat", O_WRONLY|O_CREAT|O_TRUNC, 0666) = 3
> fstat(3, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0
> mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
> 0x2aaaaaaac000
> write(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"...,
> 4194304) = 4194304
> close(3)                                = 0
> munmap(0x2aaaaaaac000, 4096)            = 0
> fstat(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 0), ...}) = 0
> mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
> 0x2aaaaaaac000
> write(1, "Wrote 4194304 bytes.\n", 21)  = 21
> exit_group(0)                           = ?
>
> execve("/home/udo/Desktop/Testqueue/write_staticmem",
> ["/home/udo/Desktop/Testqueue/writ"...], [/* 28 vars */]) = 0
> brk(0)                                  = 0x701000
> mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
> 0x2aaaaaaab000
> uname({sys="Linux", node="nc7", ...})   = 0
> access("/etc/ld.so.preload", R_OK)      = -1 ENOENT (No such file or
> directory)
> open("/etc/ld.so.cache", O_RDONLY)      = 3
> fstat(3, {st_mode=S_IFREG|0644, st_size=142108, ...}) = 0
> mmap(NULL, 142108, PROT_READ, MAP_PRIVATE, 3, 0) = 0x2aaaaaaac000
> close(3)                                = 0
> open("/lib64/libc.so.6", O_RDONLY)      = 3
> read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\300\333"..., 832)
> = 832
> fstat(3, {st_mode=S_IFREG|0755, st_size=1689824, ...}) = 0
> mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
> 0x2aaaaaacf000
> mmap(0x32f7200000, 3469528, PROT_READ|PROT_EXEC,
> MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x32f7200000
> mprotect(0x32f7347000, 2093056, PROT_NONE) = 0
> mmap(0x32f7546000, 20480, PROT_READ|PROT_WRITE,
> MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x146000) = 0x32f7546000
> mmap(0x32f754b000, 16600, PROT_READ|PROT_WRITE,
> MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x32f754b000
> close(3)                                = 0
> mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
> 0x2aaaaaad0000
> arch_prctl(ARCH_SET_FS, 0x2aaaaaad0230) = 0
> mprotect(0x32f7546000, 16384, PROT_READ) = 0
> mprotect(0x32f6419000, 4096, PROT_READ) = 0
> munmap(0x2aaaaaaac000, 142108)          = 0
> brk(0)                                  = 0x701000
> brk(0x722000)                           = 0x722000
> open("test.dat", O_WRONLY|O_CREAT|O_TRUNC, 0666) = 3
> fstat(3, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0
> mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
> 0) = 0x2aaaaaad1000
> write(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"...,
> 1048576) = 1048576
> close(3)                                = 0
> munmap(0x2aaaaaad1000, 1048576)         = 0
> fstat(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 0), ...}) = 0
> mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
> 0x2aaaaaad1000
> write(1, "Wrote 1048576 bytes.\n", 21)  = 21
> exit_group(0)                           = ?
>
> execve("/home/udo/Desktop/Testqueue/write_staticmem",
> ["/home/udo/Desktop/Testqueue/writ"...], [/* 28 vars */]) = 0
> brk(0)                                  = 0xa01000
> mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
> 0x2aaaaaaab000
> uname({sys="Linux", node="nc7", ...})   = 0
> access("/etc/ld.so.preload", R_OK)      = -1 ENOENT (No such file or
> directory)
> open("/etc/ld.so.cache", O_RDONLY)      = 3
> fstat(3, {st_mode=S_IFREG|0644, st_size=142108, ...}) = 0
> mmap(NULL, 142108, PROT_READ, MAP_PRIVATE, 3, 0) = 0x2aaaaaaac000
> close(3)                                = 0
> open("/lib64/libc.so.6", O_RDONLY)      = 3
> read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\300\333"..., 832)
> = 832
> fstat(3, {st_mode=S_IFREG|0755, st_size=1689824, ...}) = 0
> mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
> 0x2aaaaaacf000
> mmap(0x32f7200000, 3469528, PROT_READ|PROT_EXEC,
> MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x32f7200000
> mprotect(0x32f7347000, 2093056, PROT_NONE) = 0
> mmap(0x32f7546000, 20480, PROT_READ|PROT_WRITE,
> MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x146000) = 0x32f7546000
> mmap(0x32f754b000, 16600, PROT_READ|PROT_WRITE,
> MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x32f754b000
> close(3)                                = 0
> mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
> 0x2aaaaaad0000
> arch_prctl(ARCH_SET_FS, 0x2aaaaaad0230) = 0
> mprotect(0x32f7546000, 16384, PROT_READ) = 0
> mprotect(0x32f6419000, 4096, PROT_READ) = 0
> munmap(0x2aaaaaaac000, 142108)          = 0
> brk(0)                                  = 0xa01000
> brk(0xa22000)                           = 0xa22000
> open("test.dat", O_WRONLY|O_CREAT|O_TRUNC, 0666) = 3
> fstat(3, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0
> mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
> 0) = 0x2aaaaaad1000
> write(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"...,
> 4194304) = 4194304
> close(3)                                = 0
> munmap(0x2aaaaaad1000, 1048576)         = 0
> fstat(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 0), ...}) = 0
> mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
> 0x2aaaaaad1000
> write(1, "Wrote 4194304 bytes.\n", 21)  = 21
> exit_group(0)                           = ?
>
>
>


-- 
It always takes longer than you expect, even when you take into account
Hofstadter's Law.

-- Hofstadter's Law
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[Gluster-devel] Confusing the clients with echo, mv and cat, David Rotermund, 2007/09/06
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