== sanity test 255a: check 'lfs ladvise -a willread' ===== 16:47:00 (1771969620)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 0.728277 s, 144 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: 3.81492
Iter 1/10: OSS cache speed: 5.56143
Iter 1/10: ladvise speed: 5.7845
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 4.85463
Iter 2/10: OSS cache speed: 5.86656
Iter 2/10: ladvise speed: 4.79629
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 4.26313
Iter 3/10: OSS cache speed: 5.12295
Iter 3/10: ladvise speed: 5.5114
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 4.8015
Iter 4/10: OSS cache speed: 5.85904
Iter 4/10: ladvise speed: 5.88954
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 4.63047
Iter 5/10: OSS cache speed: 5.44744
Iter 5/10: ladvise speed: 5.09682
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 4.4407
Iter 6/10: OSS cache speed: 5.9294
Iter 6/10: ladvise speed: 5.71451
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 4.63094
Iter 7/10: OSS cache speed: 5.9991
Iter 7/10: ladvise speed: 5.92078
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 4.89027
Iter 8/10: OSS cache speed: 5.90733
Iter 8/10: ladvise speed: 5.74915
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 3.954
Iter 9/10: OSS cache speed: 5.81094
Iter 9/10: ladvise speed: 5.88981
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 4.26668
Iter 10/10: OSS cache speed: 5.89431
Iter 10/10: ladvise speed: 3.93352
Average uncached read: 4.45
Average speedup with OSS cached read:  5.73 = +28.76%
Average speedup with ladvise willread:  5.42 = +21.79%
Speedup with OSS cached read less than 20%,  got 5.73%. Skipping ladvise willread check.