X-Git-Url: http://gitweb.michael.orlitzky.com/?p=hath.git;a=blobdiff_plain;f=doc%2Fman1%2Fhath.1;h=6e7a618c61adbaaf7ac2cf9ccd0abb85dec56264;hp=b72896a543708c72eab258c57e134430e34970b3;hb=e8454fd0eb8af01dbba627ed707a7a45103daf3d;hpb=fe04fa7a5572f7bf46dacb960d82da3f2a2c44cf

diff --git a/doc/man1/hath.1 b/doc/man1/hath.1
index b72896a..6e7a618 100644
--- a/doc/man1/hath.1
+++ b/doc/man1/hath.1
@@ -109,6 +109,19 @@ the given CIDRs.
 198.41.0.7:
 .fi
 .P
+The DNS lookups are usually the bottleneck for this mode, but we can
+perform them in parallel. Simply pass the number of threads to the GHC
+runtime on the command line; for example, the following will perform
+25 lookups in parallel:
+.P
+.nf
+.I $ hath reversed +RTS -N25 <<< \(dq198.41.0.4/24\(dq
+198.41.0.4: a.root-servers.net.
+198.41.0.5:
+198.41.0.6: rs.internic.net.
+\(pc\(pc\(pc
+.fi
+.P
 Each of the modes also supports a present-tense flavor; the following
 are equivalent to their counterparts: \fBregex\fR, \fBreduce\fR,
 \fBdupe\fR, \fBdiff\fR, \fBlist\fR, \fBreverse\fR.