X-Git-Url: https://gitweb.michael.orlitzky.com/?a=blobdiff_plain;f=doc%2Fman1%2Fhath.1;h=6e7a618c61adbaaf7ac2cf9ccd0abb85dec56264;hb=e8454fd0eb8af01dbba627ed707a7a45103daf3d;hp=3050385bdc82fde4cd23318f284910db8e73c1dc;hpb=c8cda71c4a73a4995669c0aaa9dce904bd2dcbd6;p=hath.git

diff --git a/doc/man1/hath.1 b/doc/man1/hath.1
index 3050385..6e7a618 100644
--- a/doc/man1/hath.1
+++ b/doc/man1/hath.1
@@ -23,6 +23,10 @@ Combine small blocks into larger ones. For example, if you have two
 consecutive /24s, they might combine into a larger /23.
 .IP \(bu
 View the result of block combination in a useful way.
+.IP \(bu
+List them.
+.IP \(bu
+Find their associated PTR records.
 .P
 Hath does just that. It takes as its input (via stdin, or a file with
 the -i parameter) a list of CIDR blocks.
@@ -98,13 +102,26 @@ Perform reverse DNS (PTR) lookups on the IP addresses contained within
 the given CIDRs.
 .P
 .nf
-.I $ hath reversed <<< \(dq198.41.0.4\/30\(dq
+.I $ hath reversed <<< \(dq198.41.0.4/30\(dq
 198.41.0.4: a.root-servers.net.
 198.41.0.5:
 198.41.0.6: rs.internic.net.
 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.