== sanity test 255a: check 'lfs ladvise -a willread' ===== 17:29:47 (1715203787)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.676475 s, 155 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: 6.45142
Iter 1/10: OSS cache speed: 6.70184
Iter 1/10: ladvise speed: 6.35745
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 5.75968
Iter 2/10: OSS cache speed: 6.73488
Iter 2/10: ladvise speed: 6.57004
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 5.7874
Iter 3/10: OSS cache speed: 6.6491
Iter 3/10: ladvise speed: 6.80252
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 5.88689
Iter 4/10: OSS cache speed: 6.7517
Iter 4/10: ladvise speed: 6.65876
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 5.86414
Iter 5/10: OSS cache speed: 6.92746
Iter 5/10: ladvise speed: 6.92559
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 5.83659
Iter 6/10: OSS cache speed: 6.76948
Iter 6/10: ladvise speed: 6.90712
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 5.85697
Iter 7/10: OSS cache speed: 5.90104
Iter 7/10: ladvise speed: 3.90579
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 4.21862
Iter 8/10: OSS cache speed: 6.20689
Iter 8/10: ladvise speed: 5.83186
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 5.14264
Iter 9/10: OSS cache speed: 5.66649
Iter 9/10: ladvise speed: 6.26286
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 5.19733
Iter 10/10: OSS cache speed: 6.09944
Iter 10/10: ladvise speed: 6.07044
Average uncached read: 5.60
Average speedup with OSS cached read:  6.44 = +15.00%
Average speedup with ladvise willread:  6.22 = +11.07%
Speedup with OSS cached read less than 20%,  got 6.44%. Skipping ladvise willread check.