== sanity test 255a: check 'lfs ladvise -a willread' ===== 18:34:58 (1784759698)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 13.3474 s, 7.9 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-ffff8ebb48566800.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.276909
Iter 1/10: OSS cache speed: 0.340799
Iter 1/10: ladvise speed: 0.358603
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.280807
Iter 2/10: OSS cache speed: 0.324176
Iter 2/10: ladvise speed: 0.305497
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.317953
Iter 3/10: OSS cache speed: 0.3593
Iter 3/10: ladvise speed: 0.270432
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.303788
Iter 4/10: OSS cache speed: 0.343352
Iter 4/10: ladvise speed: 0.304688
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.315287
Iter 5/10: OSS cache speed: 0.352906
Iter 5/10: ladvise speed: 0.385762
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.306856
Iter 6/10: OSS cache speed: 0.316956
Iter 6/10: ladvise speed: 0.338854
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.32539
Iter 7/10: OSS cache speed: 0.338833
Iter 7/10: ladvise speed: 0.352493
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.31268
Iter 8/10: OSS cache speed: 0.314812
Iter 8/10: ladvise speed: 0.331134
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.295191
Iter 9/10: OSS cache speed: 0.262442
Iter 9/10: ladvise speed: 0.299458
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.249543
Iter 10/10: OSS cache speed: 0.5607
Iter 10/10: ladvise speed: 0.316111
Average uncached read: .29
Average speedup with OSS cached read:  .35 = +20%
Average speedup with ladvise willread:  .32 = +10%
fail_loc=0