== sanity test 255a: check 'lfs ladvise -a willread' ===== 09:19:28 (1785935968)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 14.4068 s, 7.3 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-ffff928010340000.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.28607
Iter 1/10: OSS cache speed: 0.257278
Iter 1/10: ladvise speed: 0.292561
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.257195
Iter 2/10: OSS cache speed: 0.330957
Iter 2/10: ladvise speed: 0.297287
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.241218
Iter 3/10: OSS cache speed: 0.232345
Iter 3/10: ladvise speed: 0.278426
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.268183
Iter 4/10: OSS cache speed: 0.291057
Iter 4/10: ladvise speed: 0.259556
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.238866
Iter 5/10: OSS cache speed: 0.269323
Iter 5/10: ladvise speed: 0.289916
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.302631
Iter 6/10: OSS cache speed: 0.310467
Iter 6/10: ladvise speed: 0.271173
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.324961
Iter 7/10: OSS cache speed: 0.227318
Iter 7/10: ladvise speed: 0.283908
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.241195
Iter 8/10: OSS cache speed: 0.294997
Iter 8/10: ladvise speed: 0.296379
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.368976
Iter 9/10: OSS cache speed: 0.289524
Iter 9/10: ladvise speed: 0.358693
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.24156
Iter 10/10: OSS cache speed: 0.313105
Iter 10/10: ladvise speed: 0.332225
Average uncached read: .27
Average speedup with OSS cached read:  .28 = +3%
Average speedup with ladvise willread:  .29 = +7%
Speedup with OSS cached read less than 20%,  got 3%. Skipping ladvise willread check.
fail_loc=0