== sanity test 255a: check 'lfs ladvise -a willread' ===== 14:34:52 (1776191692)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 2.05367 s, 51.1 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: 0.4517
Iter 1/10: OSS cache speed: 0.508997
Iter 1/10: ladvise speed: 0.459637
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.512055
Iter 2/10: OSS cache speed: 0.531423
Iter 2/10: ladvise speed: 0.552763
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.479601
Iter 3/10: OSS cache speed: 0.451736
Iter 3/10: ladvise speed: 0.498769
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.482852
Iter 4/10: OSS cache speed: 0.440377
Iter 4/10: ladvise speed: 0.426077
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.489836
Iter 5/10: OSS cache speed: 0.475035
Iter 5/10: ladvise speed: 0.399433
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.505705
Iter 6/10: OSS cache speed: 0.408323
Iter 6/10: ladvise speed: 0.469587
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.407938
Iter 7/10: OSS cache speed: 0.424702
Iter 7/10: ladvise speed: 0.472234
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.429916
Iter 8/10: OSS cache speed: 0.468466
Iter 8/10: ladvise speed: 0.468892
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.491039
Iter 9/10: OSS cache speed: 0.407496
Iter 9/10: ladvise speed: 0.470611
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.480432
Iter 10/10: OSS cache speed: 0.444748
Iter 10/10: ladvise speed: 0.353277
Average uncached read: .47
Average speedup with OSS cached read:  .45 = +-4.25%
Average speedup with ladvise willread:  .45 = +-4.25%
/home/green/git/lustre-release/lustre/tests/sanity.sh: line 21950: 0|x&“: < 20 : syntax error: operand expected (error token is "< 20 ")
lfs ladvise: cannot give advice: Unknown error 524 (524)
ladvise: cannot give advice 'dontneed' to file '/mnt/lustre/f255a.sanity': Unknown error 524
osd-zfs does not support dontneed or drop_caches