== sanity test 255a: check 'lfs ladvise -a willread' ===== 23:29:04 (1722482944)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.606026 s, 173 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: 3.58562
Iter 1/10: OSS cache speed: 3.70351
Iter 1/10: ladvise speed: 3.42586
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 3.02625
Iter 2/10: OSS cache speed: 4.10818
Iter 2/10: ladvise speed: 4.37623
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 3.5701
Iter 3/10: OSS cache speed: 3.10298
Iter 3/10: ladvise speed: 3.45511
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 3.69573
Iter 4/10: OSS cache speed: 4.14523
Iter 4/10: ladvise speed: 4.60645
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 4.66185
Iter 5/10: OSS cache speed: 4.58642
Iter 5/10: ladvise speed: 3.03872
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 3.42977
Iter 6/10: OSS cache speed: 2.97697
Iter 6/10: ladvise speed: 3.01827
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 3.04726
Iter 7/10: OSS cache speed: 2.78059
Iter 7/10: ladvise speed: 2.6578
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 2.72042
Iter 8/10: OSS cache speed: 2.8489
Iter 8/10: ladvise speed: 2.95606
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 2.66829
Iter 9/10: OSS cache speed: 2.88239
Iter 9/10: ladvise speed: 3.03035
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 2.71182
Iter 10/10: OSS cache speed: 2.56813
Iter 10/10: ladvise speed: 2.74884
Average uncached read: 3.31
Average speedup with OSS cached read:  3.37 = +1.81%
Average speedup with ladvise willread:  3.33 = +.60%
Speedup with OSS cached read less than 20%,  got 3.37%. Skipping ladvise willread check.