== sanity test 255a: check 'lfs ladvise -a willread' ===== 17:13:53 (1788815633)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 7.90414 s, 13.3 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-ffff9de8458ba800.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.535971
Iter 1/10: OSS cache speed: 0.505088
Iter 1/10: ladvise speed: 0.51166
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.547244
Iter 2/10: OSS cache speed: 0.332927
Iter 2/10: ladvise speed: 0.406972
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.44488
Iter 3/10: OSS cache speed: 0.472543
Iter 3/10: ladvise speed: 0.47345
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.455369
Iter 4/10: OSS cache speed: 0.47727
Iter 4/10: ladvise speed: 0.463983
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.479676
Iter 5/10: OSS cache speed: 0.472644
Iter 5/10: ladvise speed: 0.483705
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.48566
Iter 6/10: OSS cache speed: 0.54018
Iter 6/10: ladvise speed: 0.5398
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.554109
Iter 7/10: OSS cache speed: 0.603832
Iter 7/10: ladvise speed: 0.612791
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.636704
Iter 8/10: OSS cache speed: 0.810266
Iter 8/10: ladvise speed: 0.638781
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.289481
Iter 9/10: OSS cache speed: 0.369874
Iter 9/10: ladvise speed: 0.396875
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.379255
Iter 10/10: OSS cache speed: 0.427474
Iter 10/10: ladvise speed: 0.401647
Average uncached read: .48
Average speedup with OSS cached read:  .50 = +4%
Average speedup with ladvise willread:  .49 = +2%
Speedup with OSS cached read less than 20%,  got 4%. Skipping ladvise willread check.
fail_loc=0