== sanity test 255a: check 'lfs ladvise -a willread' ===== 14:20:09 (1776190809)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 2.52239 s, 41.6 MB/s
ladvise: range [2, 1] is invalid
Provide servers with advice about access patterns for a file.
usage: ladvise [--advice|-a ADVICE] [--start|-s START[kMGT]]
               [--background|-b] [--unset|-u]

               {--end|-e END[kMGT]|--length|-l LENGTH[kMGT]}
               {[--mode|-m [READ,WRITE]}
               <file> ...

ladvise: range [2, 2] is invalid
Provide servers with advice about access patterns for a file.
usage: ladvise [--advice|-a ADVICE] [--start|-s START[kMGT]]
               [--background|-b] [--unset|-u]

               {--end|-e END[kMGT]|--length|-l LENGTH[kMGT]}
               {[--mode|-m [READ,WRITE]}
               <file> ...

ladvise: conflicting arguments of -l and -e
Provide servers with advice about access patterns for a file.
usage: ladvise [--advice|-a ADVICE] [--start|-s START[kMGT]]
               [--background|-b] [--unset|-u]

               {--end|-e END[kMGT]|--length|-l LENGTH[kMGT]}
               {[--mode|-m [READ,WRITE]}
               <file> ...

Synchronous ladvise should wait
fail_val=4
fail_loc=0x237
Asynchronous ladvise shouldn't wait
fail_loc=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.468788
Iter 1/10: OSS cache speed: 0.556807
Iter 1/10: ladvise speed: 0.498251
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.499853
Iter 2/10: OSS cache speed: 0.518893
Iter 2/10: ladvise speed: 0.479252
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.437931
Iter 3/10: OSS cache speed: 0.517049
Iter 3/10: ladvise speed: 0.522429
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.466282
Iter 4/10: OSS cache speed: 0.534812
Iter 4/10: ladvise speed: 0.479504
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.430575
Iter 5/10: OSS cache speed: 0.510658
Iter 5/10: ladvise speed: 0.460729
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.490355
Iter 6/10: OSS cache speed: 0.479773
Iter 6/10: ladvise speed: 0.543675
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.511794
Iter 7/10: OSS cache speed: 0.537191
Iter 7/10: ladvise speed: 0.500417
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.449955
Iter 8/10: OSS cache speed: 0.457668
Iter 8/10: ladvise speed: 0.47715
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.473374
Iter 9/10: OSS cache speed: 0.455452
Iter 9/10: ladvise speed: 0.487619
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.424904
Iter 10/10: OSS cache speed: 0.425184
Iter 10/10: ladvise speed: 0.485916
Average uncached read: .46
Average speedup with OSS cached read:  .49 = +6.52%
Average speedup with ladvise willread:  .49 = +6.52%
/home/green/git/lustre-release/lustre/tests/sanity.sh: line 21950: 0Ü´Ð8: < 20 : syntax error: operand expected (error token is "< 20 ")
lfs ladvise: cannot give advice: Unknown error 524 (524)
ladvise: cannot give advice 'dontneed' to file '/mnt/lustre/f255a.sanity': Unknown error 524
osd-zfs does not support dontneed or drop_caches