== sanity test 255a: check 'lfs ladvise -a willread' ===== 20:23:22 (1789086202)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 12.3041 s, 8.5 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-ffff956f87004000.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.313835
Iter 1/10: OSS cache speed: 0.296118
Iter 1/10: ladvise speed: 0.335104
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.310704
Iter 2/10: OSS cache speed: 0.289132
Iter 2/10: ladvise speed: 0.306275
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.272159
Iter 3/10: OSS cache speed: 0.281931
Iter 3/10: ladvise speed: 0.308035
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.297418
Iter 4/10: OSS cache speed: 0.310098
Iter 4/10: ladvise speed: 0.316114
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.305519
Iter 5/10: OSS cache speed: 0.316171
Iter 5/10: ladvise speed: 0.315337
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.290811
Iter 6/10: OSS cache speed: 0.231319
Iter 6/10: ladvise speed: 0.294887
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.283068
Iter 7/10: OSS cache speed: 0.300634
Iter 7/10: ladvise speed: 0.304525
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.292407
Iter 8/10: OSS cache speed: 0.309852
Iter 8/10: ladvise speed: 0.339589
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.338748
Iter 9/10: OSS cache speed: 0.33097
Iter 9/10: ladvise speed: 0.292209
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.274244
Iter 10/10: OSS cache speed: 0.354409
Iter 10/10: ladvise speed: 0.315031
Average uncached read: .29
Average speedup with OSS cached read:  .30 = +3%
Average speedup with ladvise willread:  .31 = +6%
Speedup with OSS cached read less than 20%,  got 3%. Skipping ladvise willread check.
fail_loc=0