== sanity test 255a: check 'lfs ladvise -a willread' ===== 22:13:44 (1787710424)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 10.1896 s, 10.3 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-ffff9afc60638000.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.315384
Iter 1/10: OSS cache speed: 0.397969
Iter 1/10: ladvise speed: 0.372403
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.335314
Iter 2/10: OSS cache speed: 0.411936
Iter 2/10: ladvise speed: 0.405692
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.328246
Iter 3/10: OSS cache speed: 0.392348
Iter 3/10: ladvise speed: 0.459075
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.305096
Iter 4/10: OSS cache speed: 0.372672
Iter 4/10: ladvise speed: 0.443241
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.330801
Iter 5/10: OSS cache speed: 0.398841
Iter 5/10: ladvise speed: 0.422414
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.343022
Iter 6/10: OSS cache speed: 0.391869
Iter 6/10: ladvise speed: 0.374469
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.389174
Iter 7/10: OSS cache speed: 0.416349
Iter 7/10: ladvise speed: 0.414099
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.337568
Iter 8/10: OSS cache speed: 0.35461
Iter 8/10: ladvise speed: 0.417885
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.363413
Iter 9/10: OSS cache speed: 0.318727
Iter 9/10: ladvise speed: 0.371456
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.346171
Iter 10/10: OSS cache speed: 0.373521
Iter 10/10: ladvise speed: 0.347224
Average uncached read: .33
Average speedup with OSS cached read:  .38 = +15%
Average speedup with ladvise willread:  .40 = +21%
Speedup with OSS cached read less than 20%,  got 15%. Skipping ladvise willread check.
fail_loc=0