== sanity test 255a: check 'lfs ladvise -a willread' ===== 17:27:15 (1747258035)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.783358 s, 134 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=4
fail_loc=0x237
Asynchronous ladvise shouldn't wait
fail_loc=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 3.57441
Iter 1/10: OSS cache speed: 5.08476
Iter 1/10: ladvise speed: 6.60868
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 4.83204
Iter 2/10: OSS cache speed: 3.76534
Iter 2/10: ladvise speed: 3.70261
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 3.54983
Iter 3/10: OSS cache speed: 4.74985
Iter 3/10: ladvise speed: 4.48262
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 3.93801
Iter 4/10: OSS cache speed: 4.60701
Iter 4/10: ladvise speed: 4.51309
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 4.64685
Iter 5/10: OSS cache speed: 6.39225
Iter 5/10: ladvise speed: 5.78565
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 4.01625
Iter 6/10: OSS cache speed: 7.27343
Iter 6/10: ladvise speed: 7.09376
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 6.15525
Iter 7/10: OSS cache speed: 7.42688
Iter 7/10: ladvise speed: 6.17367
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 5.54576
Iter 8/10: OSS cache speed: 6.74268
Iter 8/10: ladvise speed: 7.22811
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 5.7852
Iter 9/10: OSS cache speed: 6.97931
Iter 9/10: ladvise speed: 6.85076
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 5.5983
Iter 10/10: OSS cache speed: 6.3109
Iter 10/10: ladvise speed: 6.19024
Average uncached read: 4.76
Average speedup with OSS cached read:  5.93 = +24.57%
Average speedup with ladvise willread:  5.86 = +23.10%
Speedup with OSS cached read less than 20%,  got 5.93%. Skipping ladvise willread check.