== sanity test 255a: check 'lfs ladvise -a willread' ===== 16:30:10 (1722544210)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.65144 s, 161 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: 5.42308
Iter 1/10: OSS cache speed: 6.34393
Iter 1/10: ladvise speed: 6.45508
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 5.09253
Iter 2/10: OSS cache speed: 5.6688
Iter 2/10: ladvise speed: 6.89914
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 6.25505
Iter 3/10: OSS cache speed: 6.42361
Iter 3/10: ladvise speed: 6.49621
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 6.18501
Iter 4/10: OSS cache speed: 7.00174
Iter 4/10: ladvise speed: 6.83508
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 5.95338
Iter 5/10: OSS cache speed: 7.52305
Iter 5/10: ladvise speed: 6.96395
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 5.58469
Iter 6/10: OSS cache speed: 6.49139
Iter 6/10: ladvise speed: 4.0154
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 3.20226
Iter 7/10: OSS cache speed: 4.62557
Iter 7/10: ladvise speed: 5.88581
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 2.25746
Iter 8/10: OSS cache speed: 2.34128
Iter 8/10: ladvise speed: 2.26427
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 1.92651
Iter 9/10: OSS cache speed: 2.3667
Iter 9/10: ladvise speed: 2.39663
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 2.75804
Iter 10/10: OSS cache speed: 4.29149
Iter 10/10: ladvise speed: 4.68451
Average uncached read: 4.46
Average speedup with OSS cached read:  5.30 = +18.83%
Average speedup with ladvise willread:  5.28 = +18.38%
Speedup with OSS cached read less than 20%,  got 5.30%. Skipping ladvise willread check.