== sanity test 255a: check 'lfs ladvise -a willread' ===== 12:38:38 (1721407118)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.549626 s, 191 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: 5.42783
Iter 1/10: OSS cache speed: 5.52449
Iter 1/10: ladvise speed: 5.21123
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 4.27819
Iter 2/10: OSS cache speed: 4.5216
Iter 2/10: ladvise speed: 4.58203
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 4.66231
Iter 3/10: OSS cache speed: 4.94811
Iter 3/10: ladvise speed: 4.84921
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 5.1013
Iter 4/10: OSS cache speed: 4.98224
Iter 4/10: ladvise speed: 5.02266
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 4.07476
Iter 5/10: OSS cache speed: 3.75415
Iter 5/10: ladvise speed: 3.32879
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 4.36133
Iter 6/10: OSS cache speed: 4.26245
Iter 6/10: ladvise speed: 4.53408
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 4.98851
Iter 7/10: OSS cache speed: 5.05131
Iter 7/10: ladvise speed: 4.83064
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 4.43461
Iter 8/10: OSS cache speed: 5.0268
Iter 8/10: ladvise speed: 5.02643
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 4.34561
Iter 9/10: OSS cache speed: 5.03855
Iter 9/10: ladvise speed: 3.86484
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 3.66728
Iter 10/10: OSS cache speed: 4.59689
Iter 10/10: ladvise speed: 3.85908
Average uncached read: 4.53
Average speedup with OSS cached read:  4.77 = +5.29%
Average speedup with ladvise willread:  4.51 = +-.44%
Speedup with OSS cached read less than 20%,  got 4.77%. Skipping ladvise willread check.