== sanity test 255a: check 'lfs ladvise -a willread' ===== 09:51:12 (1761313872)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 1.85262 s, 56.6 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: 0.701134
Iter 1/10: OSS cache speed: 0.584152
Iter 1/10: ladvise speed: 0.729036
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.666878
Iter 2/10: OSS cache speed: 0.682384
Iter 2/10: ladvise speed: 0.720377
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.736639
Iter 3/10: OSS cache speed: 0.766304
Iter 3/10: ladvise speed: 0.741163
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.738853
Iter 4/10: OSS cache speed: 0.647653
Iter 4/10: ladvise speed: 0.605451
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.726761
Iter 5/10: OSS cache speed: 0.60457
Iter 5/10: ladvise speed: 0.663337
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.632396
Iter 6/10: OSS cache speed: 0.61557
Iter 6/10: ladvise speed: 0.581728
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.549339
Iter 7/10: OSS cache speed: 0.6696
Iter 7/10: ladvise speed: 0.564721
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.602301
Iter 8/10: OSS cache speed: 0.637022
Iter 8/10: ladvise speed: 0.590105
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.488248
Iter 9/10: OSS cache speed: 0.469602
Iter 9/10: ladvise speed: 0.478814
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.53913
Iter 10/10: OSS cache speed: 0.587801
Iter 10/10: ladvise speed: 0.50773
Average uncached read: .63
Average speedup with OSS cached read:  .62 = +-1.58%
Average speedup with ladvise willread:  .61 = +-3.17%
/home/green/git/lustre-release/lustre/tests/sanity.sh: line 21871: Pl˝­<V: < 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