== sanity test 255a: check 'lfs ladvise -a willread' ===== 00:43:14 (1786077794)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 11.485 s, 9.1 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=8
fail_loc=0x237
Asynchronous ladvise shouldn't wait
llite.lustre-ffff88b088aa0800.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.47434
Iter 1/10: OSS cache speed: 0.542061
Iter 1/10: ladvise speed: 0.534506
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.500998
Iter 2/10: OSS cache speed: 0.538536
Iter 2/10: ladvise speed: 0.527256
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.511349
Iter 3/10: OSS cache speed: 0.572375
Iter 3/10: ladvise speed: 0.5264
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.433296
Iter 4/10: OSS cache speed: 0.500859
Iter 4/10: ladvise speed: 0.540781
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.489045
Iter 5/10: OSS cache speed: 0.517833
Iter 5/10: ladvise speed: 0.535141
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.492081
Iter 6/10: OSS cache speed: 0.545143
Iter 6/10: ladvise speed: 0.547244
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.522119
Iter 7/10: OSS cache speed: 0.562147
Iter 7/10: ladvise speed: 0.535455
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.522685
Iter 8/10: OSS cache speed: 0.571909
Iter 8/10: ladvise speed: 0.559763
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.490209
Iter 9/10: OSS cache speed: 0.527267
Iter 9/10: ladvise speed: 0.476868
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.469394
Iter 10/10: OSS cache speed: 0.51073
Iter 10/10: ladvise speed: 0.479134
Average uncached read: .49
Average speedup with OSS cached read:  .53 = +8%
Average speedup with ladvise willread:  .52 = +6%
Speedup with OSS cached read less than 20%,  got 8%. Skipping ladvise willread check.
fail_loc=0