== sanity test 255a: check 'lfs ladvise -a willread' ===== 09:08:57 (1747400937)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.543956 s, 193 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: 4.73528
Iter 1/10: OSS cache speed: 4.74739
Iter 1/10: ladvise speed: 4.20615
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 4.22392
Iter 2/10: OSS cache speed: 4.59773
Iter 2/10: ladvise speed: 4.31616
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 3.82984
Iter 3/10: OSS cache speed: 4.23767
Iter 3/10: ladvise speed: 4.75308
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 4.01218
Iter 4/10: OSS cache speed: 4.60056
Iter 4/10: ladvise speed: 4.79436
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 4.76164
Iter 5/10: OSS cache speed: 4.66434
Iter 5/10: ladvise speed: 4.3674
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 4.83736
Iter 6/10: OSS cache speed: 4.23039
Iter 6/10: ladvise speed: 4.31966
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 4.48749
Iter 7/10: OSS cache speed: 4.33481
Iter 7/10: ladvise speed: 4.95318
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 4.74092
Iter 8/10: OSS cache speed: 4.93566
Iter 8/10: ladvise speed: 4.46509
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 4.75705
Iter 9/10: OSS cache speed: 4.65551
Iter 9/10: ladvise speed: 4.38279
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 4.87232
Iter 10/10: OSS cache speed: 5.01255
Iter 10/10: ladvise speed: 5.08554
Average uncached read: 4.52
Average speedup with OSS cached read:  4.60 = +1.76%
Average speedup with ladvise willread:  4.56 = +.88%
Speedup with OSS cached read less than 20%,  got 4.60%. Skipping ladvise willread check.