== sanity test 255a: check 'lfs ladvise -a willread' ===== 02:10:32 (1788847832)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 13.3581 s, 7.8 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-ffff94e2c8e3d000.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.49321
Iter 1/10: OSS cache speed: 0.512122
Iter 1/10: ladvise speed: 0.503085
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.360698
Iter 2/10: OSS cache speed: 0.405701
Iter 2/10: ladvise speed: 0.498391
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.491375
Iter 3/10: OSS cache speed: 0.529171
Iter 3/10: ladvise speed: 0.535827
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.419321
Iter 4/10: OSS cache speed: 0.452656
Iter 4/10: ladvise speed: 0.523861
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.454536
Iter 5/10: OSS cache speed: 0.499956
Iter 5/10: ladvise speed: 0.482761
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.522853
Iter 6/10: OSS cache speed: 0.607904
Iter 6/10: ladvise speed: 0.625157
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.494512
Iter 7/10: OSS cache speed: 0.555912
Iter 7/10: ladvise speed: 0.612551
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.621335
Iter 8/10: OSS cache speed: 0.56437
Iter 8/10: ladvise speed: 0.608985
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.600473
Iter 9/10: OSS cache speed: 0.61782
Iter 9/10: ladvise speed: 0.60788
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.614398
Iter 10/10: OSS cache speed: 0.670699
Iter 10/10: ladvise speed: 0.699861
Average uncached read: .50
Average speedup with OSS cached read:  .54 = +8%
Average speedup with ladvise willread:  .56 = +12%
Speedup with OSS cached read less than 20%,  got 8%. Skipping ladvise willread check.
fail_loc=0