[Gluster-devel] Confusing the clients with echo, mv and cat
Anand Avati
avati at zresearch.com
Thu Sep 27 16:14:55 UTC 2007
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 <davrot at neuro.uni-bremen.de> 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 <gfs at neuro.uni-bremen.de
> > <mailto:gfs at neuro.uni-bremen.de>>:
> >
> > 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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