== sanity test 255a: check 'lfs ladvise -a willread' ===== 18:26:53 (1736983613)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.70461 s, 149 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: 5.34089
Iter 1/10: OSS cache speed: 6.24245
Iter 1/10: ladvise speed: 6.34458
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 5.61993
Iter 2/10: OSS cache speed: 6.49795
Iter 2/10: ladvise speed: 6.56002
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 5.45694
Iter 3/10: OSS cache speed: 5.43171
Iter 3/10: ladvise speed: 6.39683
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 5.60789
Iter 4/10: OSS cache speed: 6.10426
Iter 4/10: ladvise speed: 6.5183
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 5.73983
Iter 5/10: OSS cache speed: 6.61312
Iter 5/10: ladvise speed: 6.58852
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 5.70756
Iter 6/10: OSS cache speed: 6.12545
Iter 6/10: ladvise speed: 5.04198
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 4.37904
Iter 7/10: OSS cache speed: 4.63241
Iter 7/10: ladvise speed: 5.84409
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 4.2867
Iter 8/10: OSS cache speed: 4.40473
Iter 8/10: ladvise speed: 4.55494
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 4.04603
Iter 9/10: OSS cache speed: 5.01261
Iter 9/10: ladvise speed: 2.19237
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 2.01193
Iter 10/10: OSS cache speed: 4.1258
Iter 10/10: ladvise speed: 2.51018
Average uncached read: 4.81
Average speedup with OSS cached read:  5.51 = +14.55%
Average speedup with ladvise willread:  5.25 = +9.14%
Speedup with OSS cached read less than 20%,  got 5.51%. Skipping ladvise willread check.