== sanity test 255a: check 'lfs ladvise -a willread' ===== 07:27:42 (1789126062)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 12.4237 s, 8.4 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-ffff964188f04800.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.403126
Iter 1/10: OSS cache speed: 0.440325
Iter 1/10: ladvise speed: 0.33207
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.402405
Iter 2/10: OSS cache speed: 0.344876
Iter 2/10: ladvise speed: 0.396123
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.320832
Iter 3/10: OSS cache speed: 0.400038
Iter 3/10: ladvise speed: 0.400609
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.363384
Iter 4/10: OSS cache speed: 0.382164
Iter 4/10: ladvise speed: 0.412145
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.400576
Iter 5/10: OSS cache speed: 0.443583
Iter 5/10: ladvise speed: 0.400197
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.411947
Iter 6/10: OSS cache speed: 0.427602
Iter 6/10: ladvise speed: 0.403572
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.435261
Iter 7/10: OSS cache speed: 0.435217
Iter 7/10: ladvise speed: 0.428716
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.410875
Iter 8/10: OSS cache speed: 0.38841
Iter 8/10: ladvise speed: 0.351011
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.338396
Iter 9/10: OSS cache speed: 0.395244
Iter 9/10: ladvise speed: 0.355284
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.453305
Iter 10/10: OSS cache speed: 0.443888
Iter 10/10: ladvise speed: 0.41026
Average uncached read: .39
Average speedup with OSS cached read:  .41 = +5%
Average speedup with ladvise willread:  .38 = +-2%
Speedup with OSS cached read less than 20%,  got 5%. Skipping ladvise willread check.
fail_loc=0