== sanity test 255a: check 'lfs ladvise -a willread' ===== 20:48:49 (1789519729)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 8.21144 s, 12.8 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-ffff963c87ba7800.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.485825
Iter 1/10: OSS cache speed: 0.586792
Iter 1/10: ladvise speed: 0.611531
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.553414
Iter 2/10: OSS cache speed: 0.656661
Iter 2/10: ladvise speed: 0.719796
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.560824
Iter 3/10: OSS cache speed: 0.689724
Iter 3/10: ladvise speed: 0.761757
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.627513
Iter 4/10: OSS cache speed: 0.693538
Iter 4/10: ladvise speed: 0.732923
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.595314
Iter 5/10: OSS cache speed: 0.804147
Iter 5/10: ladvise speed: 1.00063
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.624645
Iter 6/10: OSS cache speed: 0.706928
Iter 6/10: ladvise speed: 0.739431
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.67163
Iter 7/10: OSS cache speed: 0.739556
Iter 7/10: ladvise speed: 0.611321
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.555798
Iter 8/10: OSS cache speed: 0.628641
Iter 8/10: ladvise speed: 0.665162
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.593267
Iter 9/10: OSS cache speed: 0.708687
Iter 9/10: ladvise speed: 0.950267
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.695809
Iter 10/10: OSS cache speed: 0.853519
Iter 10/10: ladvise speed: 0.800877
Average uncached read: .59
Average speedup with OSS cached read:  .70 = +18%
Average speedup with ladvise willread:  .75 = +27%
Speedup with OSS cached read less than 20%,  got 18%. Skipping ladvise willread check.
fail_loc=0