How to estimate the upper bound of the peak memory consumption of cryptsetup itself?

From: Coiby Xu <coxu@redhat.com>
To: cryptsetup@lists.linux.dev
Subject: How to estimate the upper bound of the peak memory consumption of cryptsetup itself?
Date: Thu, 16 Jun 2022 12:43:39 +0800	[thread overview]
Message-ID: <20220616044339.376qlipk5h2omhx2@Rk> (raw)

Hi,

Recently, I notice cryptsetup itself consumes significant amount of
memory (~256M) when estimating the memory requirement for dumping vmcore
to a LUKS-encrypted disk,

$ time -v cryptsetup luksOpen encrypted.img volume --key-file mykey.keyfile | grep "Maximum resident set size"
         Maximum resident set size (kbytes): 1309828
$ cryptsetup luksDump encrypted.img      
...
Keyslots:
   0: luks2
         PBKDF:      argon2id
         Memory:     1048576
         ...

So is there a way to estimate the upper bound of the peak memory
consumption of cryptsetup itself without running cryptsetup? 

Thanks!

-- 
Best regards,
Coiby